diff --git a/source/shared_lib/include/platform/sdl/thread.h b/source/shared_lib/include/platform/sdl/thread.h
index 5924aa9f9..7d0660c3d 100644
--- a/source/shared_lib/include/platform/sdl/thread.h
+++ b/source/shared_lib/include/platform/sdl/thread.h
@@ -261,6 +261,7 @@ public:
 
             return result;
 		}
+		return 0;
 	}
 
     inline void ReleaseLock(bool keepMutex=false,bool deleteMutexOnRelease=false) {