diff --git a/public/engine/IEngineService.h b/public/engine/IEngineService.h
index c06918aa..e014d0c9 100644
--- a/public/engine/IEngineService.h
+++ b/public/engine/IEngineService.h
@@ -100,7 +100,7 @@ public:
 	// Same methods as IVEngineServer2 
 	virtual void		SetFrameTimeAmnesty( const char *amnesty, int, float frametime ) = 0;
 	virtual const char *GetFrameTimeAmnesty( bool check_cvar ) = 0;
-	virtual void		unk301( const char *, int, int, float ) = 0;
+	virtual void		unk301( const char *, uint16 ) = 0;
 #ifdef _LINUX
 	virtual void		UnregisterPrerequisite( IPrerequisite * ) = 0;
 #endif