diff --git a/.github/workflows/gemini-dispatch.yml b/.github/workflows/gemini-dispatch.yml
index 5da504e..aa0f9d2 100644
--- a/.github/workflows/gemini-dispatch.yml
+++ b/.github/workflows/gemini-dispatch.yml
@@ -43,12 +43,13 @@ jobs:
           env | grep '^DEBUG_'
 
   dispatch:
-    # For PRs
+    # For PRs: only if not from a fork
     # For comments: only if user types @gemini-cli and is OWNER/MEMBER/COLLABORATOR
     # For issues: only on open/reopen
     if: |-
       (
-        github.event_name == 'pull_request'
+        github.event_name == 'pull_request' &&
+        github.event.pull_request.head.repo.fork == false
       ) || (
         github.event.sender.type == 'User' &&
         startsWith(github.event.comment.body || github.event.review.body || github.event.issue.body, '@gemini-cli') &&