diff --git a/src/GameSoundManager.cpp b/src/GameSoundManager.cpp
index 49b0943c50..3a172b1c6d 100644
--- a/src/GameSoundManager.cpp
+++ b/src/GameSoundManager.cpp
@@ -806,6 +806,7 @@ class LunaGameSoundManager : public Luna<GameSoundManager>
 		pRet->Set(fVol);
 		SOUNDMAN->SetMixVolume();
 		p->DimMusic(FArg(1), 0.01f);	// lazy hack to update volume without changing songs - mina
+		return 0;
 	}
 	static int PlayOnce(T* p, lua_State* L)
 	{