diff --git a/modules/openapi-generator/src/main/resources/rust-axum/lib.mustache b/modules/openapi-generator/src/main/resources/rust-axum/lib.mustache
index 7f197ef5f0ff..153ffa6d00bd 100644
--- a/modules/openapi-generator/src/main/resources/rust-axum/lib.mustache
+++ b/modules/openapi-generator/src/main/resources/rust-axum/lib.mustache
@@ -14,6 +14,8 @@
     clippy::too_many_arguments
 )]
 
+extern crate futures_util;
+
 pub const BASE_PATH: &str = "{{{basePathWithoutHost}}}";
 {{#appVersion}}
 pub const API_VERSION: &str = "{{{.}}}";
diff --git a/modules/openapi-generator/src/main/resources/rust-axum/models.mustache b/modules/openapi-generator/src/main/resources/rust-axum/models.mustache
index ffa36a85dbc6..cc6d895369d1 100644
--- a/modules/openapi-generator/src/main/resources/rust-axum/models.mustache
+++ b/modules/openapi-generator/src/main/resources/rust-axum/models.mustache
@@ -8,7 +8,7 @@ use crate::header;
 use crate::{models, types::*};
 
 #[allow(dead_code)]
-pub type SSE = std::pin::Pin<Box<dyn futures_util::Stream<Item = Result<axum::response::sse::Event, std::convert::Infallible>> + Send + Sync>>;
+pub type SSE = std::pin::Pin<std::boxed::Box<dyn futures_util::Stream<Item = std::result::Result<axum::response::sse::Event, std::convert::Infallible>> + std::marker::Send + std::marker::Sync>>;
 
 #[allow(dead_code)]
 fn from_validation_error(e: validator::ValidationError) -> validator::ValidationErrors {
diff --git a/samples/server/petstore/rust-axum/output/apikey-authorization/src/lib.rs b/samples/server/petstore/rust-axum/output/apikey-authorization/src/lib.rs
index d461afebe02e..619411029944 100644
--- a/samples/server/petstore/rust-axum/output/apikey-authorization/src/lib.rs
+++ b/samples/server/petstore/rust-axum/output/apikey-authorization/src/lib.rs
@@ -14,6 +14,8 @@
     clippy::too_many_arguments
 )]
 
+extern crate futures_util;
+
 pub const BASE_PATH: &str = "/v71";
 pub const API_VERSION: &str = "1.0.0";
 
diff --git a/samples/server/petstore/rust-axum/output/apikey-authorization/src/models.rs b/samples/server/petstore/rust-axum/output/apikey-authorization/src/models.rs
index 9eb40f9cd877..9c3f093a7ad4 100644
--- a/samples/server/petstore/rust-axum/output/apikey-authorization/src/models.rs
+++ b/samples/server/petstore/rust-axum/output/apikey-authorization/src/models.rs
@@ -7,6 +7,16 @@ use validator::Validate;
 use crate::header;
 use crate::{models, types::*};
 
+#[allow(dead_code)]
+pub type SSE = std::pin::Pin<
+    std::boxed::Box<
+        dyn futures_util::Stream<
+                Item = std::result::Result<axum::response::sse::Event, std::convert::Infallible>,
+            > + std::marker::Send
+            + std::marker::Sync,
+    >,
+>;
+
 #[allow(dead_code)]
 fn from_validation_error(e: validator::ValidationError) -> validator::ValidationErrors {
     let mut errs = validator::ValidationErrors::new();
diff --git a/samples/server/petstore/rust-axum/output/apikey-auths/src/lib.rs b/samples/server/petstore/rust-axum/output/apikey-auths/src/lib.rs
index d461afebe02e..619411029944 100644
--- a/samples/server/petstore/rust-axum/output/apikey-auths/src/lib.rs
+++ b/samples/server/petstore/rust-axum/output/apikey-auths/src/lib.rs
@@ -14,6 +14,8 @@
     clippy::too_many_arguments
 )]
 
+extern crate futures_util;
+
 pub const BASE_PATH: &str = "/v71";
 pub const API_VERSION: &str = "1.0.0";
 
diff --git a/samples/server/petstore/rust-axum/output/apikey-auths/src/models.rs b/samples/server/petstore/rust-axum/output/apikey-auths/src/models.rs
index 9eb40f9cd877..9c3f093a7ad4 100644
--- a/samples/server/petstore/rust-axum/output/apikey-auths/src/models.rs
+++ b/samples/server/petstore/rust-axum/output/apikey-auths/src/models.rs
@@ -7,6 +7,16 @@ use validator::Validate;
 use crate::header;
 use crate::{models, types::*};
 
+#[allow(dead_code)]
+pub type SSE = std::pin::Pin<
+    std::boxed::Box<
+        dyn futures_util::Stream<
+                Item = std::result::Result<axum::response::sse::Event, std::convert::Infallible>,
+            > + std::marker::Send
+            + std::marker::Sync,
+    >,
+>;
+
 #[allow(dead_code)]
 fn from_validation_error(e: validator::ValidationError) -> validator::ValidationErrors {
     let mut errs = validator::ValidationErrors::new();
diff --git a/samples/server/petstore/rust-axum/output/multipart-v3/src/lib.rs b/samples/server/petstore/rust-axum/output/multipart-v3/src/lib.rs
index cc053adc1ca5..ea9c8de34b6f 100644
--- a/samples/server/petstore/rust-axum/output/multipart-v3/src/lib.rs
+++ b/samples/server/petstore/rust-axum/output/multipart-v3/src/lib.rs
@@ -14,6 +14,8 @@
     clippy::too_many_arguments
 )]
 
+extern crate futures_util;
+
 pub const BASE_PATH: &str = "";
 pub const API_VERSION: &str = "1.0.7";
 
diff --git a/samples/server/petstore/rust-axum/output/multipart-v3/src/models.rs b/samples/server/petstore/rust-axum/output/multipart-v3/src/models.rs
index 918f39a7fa37..dad6f8bc2d5b 100644
--- a/samples/server/petstore/rust-axum/output/multipart-v3/src/models.rs
+++ b/samples/server/petstore/rust-axum/output/multipart-v3/src/models.rs
@@ -7,6 +7,16 @@ use validator::Validate;
 use crate::header;
 use crate::{models, types::*};
 
+#[allow(dead_code)]
+pub type SSE = std::pin::Pin<
+    std::boxed::Box<
+        dyn futures_util::Stream<
+                Item = std::result::Result<axum::response::sse::Event, std::convert::Infallible>,
+            > + std::marker::Send
+            + std::marker::Sync,
+    >,
+>;
+
 #[allow(dead_code)]
 fn from_validation_error(e: validator::ValidationError) -> validator::ValidationErrors {
     let mut errs = validator::ValidationErrors::new();
diff --git a/samples/server/petstore/rust-axum/output/openapi-v3/src/lib.rs b/samples/server/petstore/rust-axum/output/openapi-v3/src/lib.rs
index cc053adc1ca5..ea9c8de34b6f 100644
--- a/samples/server/petstore/rust-axum/output/openapi-v3/src/lib.rs
+++ b/samples/server/petstore/rust-axum/output/openapi-v3/src/lib.rs
@@ -14,6 +14,8 @@
     clippy::too_many_arguments
 )]
 
+extern crate futures_util;
+
 pub const BASE_PATH: &str = "";
 pub const API_VERSION: &str = "1.0.7";
 
diff --git a/samples/server/petstore/rust-axum/output/openapi-v3/src/models.rs b/samples/server/petstore/rust-axum/output/openapi-v3/src/models.rs
index 22ccac1d4315..679c17f36cc0 100644
--- a/samples/server/petstore/rust-axum/output/openapi-v3/src/models.rs
+++ b/samples/server/petstore/rust-axum/output/openapi-v3/src/models.rs
@@ -7,6 +7,16 @@ use validator::Validate;
 use crate::header;
 use crate::{models, types::*};
 
+#[allow(dead_code)]
+pub type SSE = std::pin::Pin<
+    std::boxed::Box<
+        dyn futures_util::Stream<
+                Item = std::result::Result<axum::response::sse::Event, std::convert::Infallible>,
+            > + std::marker::Send
+            + std::marker::Sync,
+    >,
+>;
+
 #[allow(dead_code)]
 fn from_validation_error(e: validator::ValidationError) -> validator::ValidationErrors {
     let mut errs = validator::ValidationErrors::new();
diff --git a/samples/server/petstore/rust-axum/output/ops-v3/src/lib.rs b/samples/server/petstore/rust-axum/output/ops-v3/src/lib.rs
index bfdd7c899236..b9efa68d49c1 100644
--- a/samples/server/petstore/rust-axum/output/ops-v3/src/lib.rs
+++ b/samples/server/petstore/rust-axum/output/ops-v3/src/lib.rs
@@ -14,6 +14,8 @@
     clippy::too_many_arguments
 )]
 
+extern crate futures_util;
+
 pub const BASE_PATH: &str = "";
 pub const API_VERSION: &str = "0.0.1";
 
diff --git a/samples/server/petstore/rust-axum/output/ops-v3/src/models.rs b/samples/server/petstore/rust-axum/output/ops-v3/src/models.rs
index 70fa12a8ed93..0fd4ca1e0612 100644
--- a/samples/server/petstore/rust-axum/output/ops-v3/src/models.rs
+++ b/samples/server/petstore/rust-axum/output/ops-v3/src/models.rs
@@ -7,6 +7,16 @@ use validator::Validate;
 use crate::header;
 use crate::{models, types::*};
 
+#[allow(dead_code)]
+pub type SSE = std::pin::Pin<
+    std::boxed::Box<
+        dyn futures_util::Stream<
+                Item = std::result::Result<axum::response::sse::Event, std::convert::Infallible>,
+            > + std::marker::Send
+            + std::marker::Sync,
+    >,
+>;
+
 #[allow(dead_code)]
 fn from_validation_error(e: validator::ValidationError) -> validator::ValidationErrors {
     let mut errs = validator::ValidationErrors::new();
diff --git a/samples/server/petstore/rust-axum/output/petstore-with-fake-endpoints-models-for-testing/src/lib.rs b/samples/server/petstore/rust-axum/output/petstore-with-fake-endpoints-models-for-testing/src/lib.rs
index 91d8f87a36a8..071b66d420a4 100644
--- a/samples/server/petstore/rust-axum/output/petstore-with-fake-endpoints-models-for-testing/src/lib.rs
+++ b/samples/server/petstore/rust-axum/output/petstore-with-fake-endpoints-models-for-testing/src/lib.rs
@@ -14,6 +14,8 @@
     clippy::too_many_arguments
 )]
 
+extern crate futures_util;
+
 pub const BASE_PATH: &str = "/v2";
 pub const API_VERSION: &str = "1.0.0";
 
diff --git a/samples/server/petstore/rust-axum/output/petstore-with-fake-endpoints-models-for-testing/src/models.rs b/samples/server/petstore/rust-axum/output/petstore-with-fake-endpoints-models-for-testing/src/models.rs
index e47738e7fa72..5483af09a957 100644
--- a/samples/server/petstore/rust-axum/output/petstore-with-fake-endpoints-models-for-testing/src/models.rs
+++ b/samples/server/petstore/rust-axum/output/petstore-with-fake-endpoints-models-for-testing/src/models.rs
@@ -7,6 +7,16 @@ use validator::Validate;
 use crate::header;
 use crate::{models, types::*};
 
+#[allow(dead_code)]
+pub type SSE = std::pin::Pin<
+    std::boxed::Box<
+        dyn futures_util::Stream<
+                Item = std::result::Result<axum::response::sse::Event, std::convert::Infallible>,
+            > + std::marker::Send
+            + std::marker::Sync,
+    >,
+>;
+
 #[allow(dead_code)]
 fn from_validation_error(e: validator::ValidationError) -> validator::ValidationErrors {
     let mut errs = validator::ValidationErrors::new();
diff --git a/samples/server/petstore/rust-axum/output/petstore/src/lib.rs b/samples/server/petstore/rust-axum/output/petstore/src/lib.rs
index 91d8f87a36a8..071b66d420a4 100644
--- a/samples/server/petstore/rust-axum/output/petstore/src/lib.rs
+++ b/samples/server/petstore/rust-axum/output/petstore/src/lib.rs
@@ -14,6 +14,8 @@
     clippy::too_many_arguments
 )]
 
+extern crate futures_util;
+
 pub const BASE_PATH: &str = "/v2";
 pub const API_VERSION: &str = "1.0.0";
 
diff --git a/samples/server/petstore/rust-axum/output/petstore/src/models.rs b/samples/server/petstore/rust-axum/output/petstore/src/models.rs
index 70dab700257e..1a8679a0617e 100644
--- a/samples/server/petstore/rust-axum/output/petstore/src/models.rs
+++ b/samples/server/petstore/rust-axum/output/petstore/src/models.rs
@@ -7,6 +7,16 @@ use validator::Validate;
 use crate::header;
 use crate::{models, types::*};
 
+#[allow(dead_code)]
+pub type SSE = std::pin::Pin<
+    std::boxed::Box<
+        dyn futures_util::Stream<
+                Item = std::result::Result<axum::response::sse::Event, std::convert::Infallible>,
+            > + std::marker::Send
+            + std::marker::Sync,
+    >,
+>;
+
 #[allow(dead_code)]
 fn from_validation_error(e: validator::ValidationError) -> validator::ValidationErrors {
     let mut errs = validator::ValidationErrors::new();
diff --git a/samples/server/petstore/rust-axum/output/ping-bearer-auth/src/lib.rs b/samples/server/petstore/rust-axum/output/ping-bearer-auth/src/lib.rs
index 127b67da835e..16bdc1559d6e 100644
--- a/samples/server/petstore/rust-axum/output/ping-bearer-auth/src/lib.rs
+++ b/samples/server/petstore/rust-axum/output/ping-bearer-auth/src/lib.rs
@@ -14,6 +14,8 @@
     clippy::too_many_arguments
 )]
 
+extern crate futures_util;
+
 pub const BASE_PATH: &str = "";
 pub const API_VERSION: &str = "1.0";
 
diff --git a/samples/server/petstore/rust-axum/output/ping-bearer-auth/src/models.rs b/samples/server/petstore/rust-axum/output/ping-bearer-auth/src/models.rs
index 70fa12a8ed93..0fd4ca1e0612 100644
--- a/samples/server/petstore/rust-axum/output/ping-bearer-auth/src/models.rs
+++ b/samples/server/petstore/rust-axum/output/ping-bearer-auth/src/models.rs
@@ -7,6 +7,16 @@ use validator::Validate;
 use crate::header;
 use crate::{models, types::*};
 
+#[allow(dead_code)]
+pub type SSE = std::pin::Pin<
+    std::boxed::Box<
+        dyn futures_util::Stream<
+                Item = std::result::Result<axum::response::sse::Event, std::convert::Infallible>,
+            > + std::marker::Send
+            + std::marker::Sync,
+    >,
+>;
+
 #[allow(dead_code)]
 fn from_validation_error(e: validator::ValidationError) -> validator::ValidationErrors {
     let mut errs = validator::ValidationErrors::new();
diff --git a/samples/server/petstore/rust-axum/output/rust-axum-array-params-test/src/lib.rs b/samples/server/petstore/rust-axum/output/rust-axum-array-params-test/src/lib.rs
index bfdd7c899236..b9efa68d49c1 100644
--- a/samples/server/petstore/rust-axum/output/rust-axum-array-params-test/src/lib.rs
+++ b/samples/server/petstore/rust-axum/output/rust-axum-array-params-test/src/lib.rs
@@ -14,6 +14,8 @@
     clippy::too_many_arguments
 )]
 
+extern crate futures_util;
+
 pub const BASE_PATH: &str = "";
 pub const API_VERSION: &str = "0.0.1";
 
diff --git a/samples/server/petstore/rust-axum/output/rust-axum-array-params-test/src/models.rs b/samples/server/petstore/rust-axum/output/rust-axum-array-params-test/src/models.rs
index c89e194cc6c0..d5fea6b3c719 100644
--- a/samples/server/petstore/rust-axum/output/rust-axum-array-params-test/src/models.rs
+++ b/samples/server/petstore/rust-axum/output/rust-axum-array-params-test/src/models.rs
@@ -7,6 +7,16 @@ use validator::Validate;
 use crate::header;
 use crate::{models, types::*};
 
+#[allow(dead_code)]
+pub type SSE = std::pin::Pin<
+    std::boxed::Box<
+        dyn futures_util::Stream<
+                Item = std::result::Result<axum::response::sse::Event, std::convert::Infallible>,
+            > + std::marker::Send
+            + std::marker::Sync,
+    >,
+>;
+
 #[allow(dead_code)]
 fn from_validation_error(e: validator::ValidationError) -> validator::ValidationErrors {
     let mut errs = validator::ValidationErrors::new();
diff --git a/samples/server/petstore/rust-axum/output/rust-axum-header-uuid/src/lib.rs b/samples/server/petstore/rust-axum/output/rust-axum-header-uuid/src/lib.rs
index 7f6af70e59f7..0b593a896728 100644
--- a/samples/server/petstore/rust-axum/output/rust-axum-header-uuid/src/lib.rs
+++ b/samples/server/petstore/rust-axum/output/rust-axum-header-uuid/src/lib.rs
@@ -14,6 +14,8 @@
     clippy::too_many_arguments
 )]
 
+extern crate futures_util;
+
 pub const BASE_PATH: &str = "";
 pub const API_VERSION: &str = "0.1.9";
 
diff --git a/samples/server/petstore/rust-axum/output/rust-axum-header-uuid/src/models.rs b/samples/server/petstore/rust-axum/output/rust-axum-header-uuid/src/models.rs
index 6eec2068e67c..a143a801c26d 100644
--- a/samples/server/petstore/rust-axum/output/rust-axum-header-uuid/src/models.rs
+++ b/samples/server/petstore/rust-axum/output/rust-axum-header-uuid/src/models.rs
@@ -7,6 +7,16 @@ use validator::Validate;
 use crate::header;
 use crate::{models, types::*};
 
+#[allow(dead_code)]
+pub type SSE = std::pin::Pin<
+    std::boxed::Box<
+        dyn futures_util::Stream<
+                Item = std::result::Result<axum::response::sse::Event, std::convert::Infallible>,
+            > + std::marker::Send
+            + std::marker::Sync,
+    >,
+>;
+
 #[allow(dead_code)]
 fn from_validation_error(e: validator::ValidationError) -> validator::ValidationErrors {
     let mut errs = validator::ValidationErrors::new();
diff --git a/samples/server/petstore/rust-axum/output/rust-axum-integer-types-test/src/lib.rs b/samples/server/petstore/rust-axum/output/rust-axum-integer-types-test/src/lib.rs
index 128cc87575eb..a63c5aa7e55e 100644
--- a/samples/server/petstore/rust-axum/output/rust-axum-integer-types-test/src/lib.rs
+++ b/samples/server/petstore/rust-axum/output/rust-axum-integer-types-test/src/lib.rs
@@ -14,6 +14,8 @@
     clippy::too_many_arguments
 )]
 
+extern crate futures_util;
+
 pub const BASE_PATH: &str = "";
 pub const API_VERSION: &str = "1.0.0";
 
diff --git a/samples/server/petstore/rust-axum/output/rust-axum-integer-types-test/src/models.rs b/samples/server/petstore/rust-axum/output/rust-axum-integer-types-test/src/models.rs
index 87f1b5895485..de7d5da11121 100644
--- a/samples/server/petstore/rust-axum/output/rust-axum-integer-types-test/src/models.rs
+++ b/samples/server/petstore/rust-axum/output/rust-axum-integer-types-test/src/models.rs
@@ -7,6 +7,16 @@ use validator::Validate;
 use crate::header;
 use crate::{models, types::*};
 
+#[allow(dead_code)]
+pub type SSE = std::pin::Pin<
+    std::boxed::Box<
+        dyn futures_util::Stream<
+                Item = std::result::Result<axum::response::sse::Event, std::convert::Infallible>,
+            > + std::marker::Send
+            + std::marker::Sync,
+    >,
+>;
+
 #[allow(dead_code)]
 fn from_validation_error(e: validator::ValidationError) -> validator::ValidationErrors {
     let mut errs = validator::ValidationErrors::new();
diff --git a/samples/server/petstore/rust-axum/output/rust-axum-oneof/src/lib.rs b/samples/server/petstore/rust-axum/output/rust-axum-oneof/src/lib.rs
index bfdd7c899236..b9efa68d49c1 100644
--- a/samples/server/petstore/rust-axum/output/rust-axum-oneof/src/lib.rs
+++ b/samples/server/petstore/rust-axum/output/rust-axum-oneof/src/lib.rs
@@ -14,6 +14,8 @@
     clippy::too_many_arguments
 )]
 
+extern crate futures_util;
+
 pub const BASE_PATH: &str = "";
 pub const API_VERSION: &str = "0.0.1";
 
diff --git a/samples/server/petstore/rust-axum/output/rust-axum-oneof/src/models.rs b/samples/server/petstore/rust-axum/output/rust-axum-oneof/src/models.rs
index caa96343c512..8e3854c4583b 100644
--- a/samples/server/petstore/rust-axum/output/rust-axum-oneof/src/models.rs
+++ b/samples/server/petstore/rust-axum/output/rust-axum-oneof/src/models.rs
@@ -7,6 +7,16 @@ use validator::Validate;
 use crate::header;
 use crate::{models, types::*};
 
+#[allow(dead_code)]
+pub type SSE = std::pin::Pin<
+    std::boxed::Box<
+        dyn futures_util::Stream<
+                Item = std::result::Result<axum::response::sse::Event, std::convert::Infallible>,
+            > + std::marker::Send
+            + std::marker::Sync,
+    >,
+>;
+
 #[allow(dead_code)]
 fn from_validation_error(e: validator::ValidationError) -> validator::ValidationErrors {
     let mut errs = validator::ValidationErrors::new();
diff --git a/samples/server/petstore/rust-axum/output/rust-axum-sse/src/lib.rs b/samples/server/petstore/rust-axum/output/rust-axum-sse/src/lib.rs
index 128cc87575eb..a63c5aa7e55e 100644
--- a/samples/server/petstore/rust-axum/output/rust-axum-sse/src/lib.rs
+++ b/samples/server/petstore/rust-axum/output/rust-axum-sse/src/lib.rs
@@ -14,6 +14,8 @@
     clippy::too_many_arguments
 )]
 
+extern crate futures_util;
+
 pub const BASE_PATH: &str = "";
 pub const API_VERSION: &str = "1.0.0";
 
diff --git a/samples/server/petstore/rust-axum/output/rust-axum-sse/src/models.rs b/samples/server/petstore/rust-axum/output/rust-axum-sse/src/models.rs
index 7b1f08360158..d622e0e78165 100644
--- a/samples/server/petstore/rust-axum/output/rust-axum-sse/src/models.rs
+++ b/samples/server/petstore/rust-axum/output/rust-axum-sse/src/models.rs
@@ -9,11 +9,11 @@ use crate::{models, types::*};
 
 #[allow(dead_code)]
 pub type SSE = std::pin::Pin<
-    Box<
+    std::boxed::Box<
         dyn futures_util::Stream<
-                Item = Result<axum::response::sse::Event, std::convert::Infallible>,
-            > + Send
-            + Sync,
+                Item = std::result::Result<axum::response::sse::Event, std::convert::Infallible>,
+            > + std::marker::Send
+            + std::marker::Sync,
     >,
 >;
 
diff --git a/samples/server/petstore/rust-axum/output/rust-axum-test/src/lib.rs b/samples/server/petstore/rust-axum/output/rust-axum-test/src/lib.rs
index d9085fbe8b9b..91fd90013733 100644
--- a/samples/server/petstore/rust-axum/output/rust-axum-test/src/lib.rs
+++ b/samples/server/petstore/rust-axum/output/rust-axum-test/src/lib.rs
@@ -14,6 +14,8 @@
     clippy::too_many_arguments
 )]
 
+extern crate futures_util;
+
 pub const BASE_PATH: &str = "";
 pub const API_VERSION: &str = "2.3.4";
 
diff --git a/samples/server/petstore/rust-axum/output/rust-axum-test/src/models.rs b/samples/server/petstore/rust-axum/output/rust-axum-test/src/models.rs
index a25538279865..dc87a27caac9 100644
--- a/samples/server/petstore/rust-axum/output/rust-axum-test/src/models.rs
+++ b/samples/server/petstore/rust-axum/output/rust-axum-test/src/models.rs
@@ -7,6 +7,16 @@ use validator::Validate;
 use crate::header;
 use crate::{models, types::*};
 
+#[allow(dead_code)]
+pub type SSE = std::pin::Pin<
+    std::boxed::Box<
+        dyn futures_util::Stream<
+                Item = std::result::Result<axum::response::sse::Event, std::convert::Infallible>,
+            > + std::marker::Send
+            + std::marker::Sync,
+    >,
+>;
+
 #[allow(dead_code)]
 fn from_validation_error(e: validator::ValidationError) -> validator::ValidationErrors {
     let mut errs = validator::ValidationErrors::new();
diff --git a/samples/server/petstore/rust-axum/output/rust-axum-validation-test/src/lib.rs b/samples/server/petstore/rust-axum/output/rust-axum-validation-test/src/lib.rs
index bfdd7c899236..b9efa68d49c1 100644
--- a/samples/server/petstore/rust-axum/output/rust-axum-validation-test/src/lib.rs
+++ b/samples/server/petstore/rust-axum/output/rust-axum-validation-test/src/lib.rs
@@ -14,6 +14,8 @@
     clippy::too_many_arguments
 )]
 
+extern crate futures_util;
+
 pub const BASE_PATH: &str = "";
 pub const API_VERSION: &str = "0.0.1";
 
diff --git a/samples/server/petstore/rust-axum/output/rust-axum-validation-test/src/models.rs b/samples/server/petstore/rust-axum/output/rust-axum-validation-test/src/models.rs
index 229b571c986e..bd8269f6cb10 100644
--- a/samples/server/petstore/rust-axum/output/rust-axum-validation-test/src/models.rs
+++ b/samples/server/petstore/rust-axum/output/rust-axum-validation-test/src/models.rs
@@ -7,6 +7,16 @@ use validator::Validate;
 use crate::header;
 use crate::{models, types::*};
 
+#[allow(dead_code)]
+pub type SSE = std::pin::Pin<
+    std::boxed::Box<
+        dyn futures_util::Stream<
+                Item = std::result::Result<axum::response::sse::Event, std::convert::Infallible>,
+            > + std::marker::Send
+            + std::marker::Sync,
+    >,
+>;
+
 #[allow(dead_code)]
 fn from_validation_error(e: validator::ValidationError) -> validator::ValidationErrors {
     let mut errs = validator::ValidationErrors::new();