diff --git a/source/backend/engine/CarlaEngineNative.cpp b/source/backend/engine/CarlaEngineNative.cpp
index 62be17d73..3d66a06c9 100644
--- a/source/backend/engine/CarlaEngineNative.cpp
+++ b/source/backend/engine/CarlaEngineNative.cpp
@@ -1743,6 +1743,8 @@ private:
 
             for (; msgMgr->dispatchNextMessageOnSystemQueue(true);) {}
         }
+
+        CARLA_DECLARE_NON_COPY_STRUCT(ScopedJuceMessageThreadRunner)
     };
 #endif