diff --git a/webrtc/typedefs.h b/webrtc/typedefs.h
index 65aa1aded5..16e10c5ea1 100644
--- a/webrtc/typedefs.h
+++ b/webrtc/typedefs.h
@@ -98,6 +98,7 @@
 #endif
 #endif
 
+#ifndef NO_RETURN
 // Annotate a function that will not return control flow to the caller.
 #if defined(_MSC_VER)
 #define NO_RETURN __declspec(noreturn)
@@ -106,5 +107,6 @@
 #else
 #define NO_RETURN
 #endif
+#endif
 
 #endif  // WEBRTC_TYPEDEFS_H_