diff --git a/Libs/ois/win32/Win32ForceFeedback.h b/Libs/ois/win32/Win32ForceFeedback.h
index 427286649..9c1f5d2ff 100644
--- a/Libs/ois/win32/Win32ForceFeedback.h
+++ b/Libs/ois/win32/Win32ForceFeedback.h
@@ -92,7 +92,7 @@ namespace OIS
 		//Sets the common properties to all effects
 		void _setCommonProperties(DIEFFECT* diEffect, DWORD* rgdwAxes, LONG* rglDirection, DIENVELOPE* diEnvelope, DWORD struct_size, LPVOID struct_type, const Effect* effect, const Envelope* envelope);
 		//Actually do the upload
-		void _upload(GUID, DIEFFECT*, const Effect*);
+		void _upload(const GUID&, DIEFFECT*, const Effect*);
 
 		// Map of currently uploaded effects (handle => effect)
 		typedef std::map<int, LPDIRECTINPUTEFFECT> EffectList;