diff --git a/src/libecflow_light/ecflow/light/TinyREST.h b/src/libecflow_light/ecflow/light/TinyREST.h
index ae7e964..db274fa 100644
--- a/src/libecflow_light/ecflow/light/TinyREST.h
+++ b/src/libecflow_light/ecflow/light/TinyREST.h
@@ -17,6 +17,7 @@
 #include <string>
 #include <string_view>
 #include <vector>
+#include <cstdint>
 
 #include "ecflow/light/StringUtils.h"