diff --git a/engine/client/in_win.c b/engine/client/in_win.c
index f7047daed..53b01f16d 100644
--- a/engine/client/in_win.c
+++ b/engine/client/in_win.c
@@ -1608,6 +1608,7 @@ void INS_SetupControllerAudioDevices(void)
 	{
 		char audiodevicename[MAX_QPATH];
 		wchar_t mssuck[MAX_QPATH];
+		static GUID GUID_NULL;
 		GUID gplayback = GUID_NULL;
 		GUID gcapture = GUID_NULL;
 		if (!wjoy[i].isxinput)