diff --git a/source/backend/plugin/Makefile b/source/backend/plugin/Makefile
index 013d97a29..cdb716c6f 100644
--- a/source/backend/plugin/Makefile
+++ b/source/backend/plugin/Makefile
@@ -82,7 +82,7 @@ Lv2Plugin.cpp.o: Lv2Plugin.cpp $(CARLA_PLUGIN_INTERNAL_HPP) $(CARLA_ENGINE_HPP)
 	$(CXX) $< $(BUILD_CXX_FLAGS) $(QTCORE_FLAGS) -c -o $@
 
 VstPlugin.cpp.o: VstPlugin.cpp $(CARLA_PLUGIN_INTERNAL_HPP) $(CARLA_ENGINE_HPP) $(CARLA_VST_UTILS_HPP) $(CARLA_MATH_UTILS_HPP) $(CARLA_PLUGIN_UI_HPP)
-	$(CXX) $< $(BUILD_CXX_FLAGS) -c -o $@
+	$(CXX) $< $(BUILD_CXX_FLAGS) $(QTCORE_FLAGS) -c -o $@
 
 AuPlugin.cpp.o: AuPlugin.cpp $(CARLA_PLUGIN_HPP) $(CARLA_ENGINE_HPP) $(CARLA_UTILS_HPP)
 	$(CXX) $< $(BUILD_CXX_FLAGS) -c -o $@