diff --git a/libraries/audio/src/AudioInjector.h b/libraries/audio/src/AudioInjector.h
index 2abc445034..7d57708738 100644
--- a/libraries/audio/src/AudioInjector.h
+++ b/libraries/audio/src/AudioInjector.h
@@ -121,5 +121,6 @@ private:
     friend class AudioInjectorManager;
 };
 
+Q_DECLARE_METATYPE(AudioInjector*)
     
 #endif // hifi_AudioInjector_h