diff --git a/interface/wx/mousestate.h b/interface/wx/mousestate.h
index 4562f3a3db..2c5b4f9313 100644
--- a/interface/wx/mousestate.h
+++ b/interface/wx/mousestate.h
@@ -107,7 +107,7 @@ public:
 
     void SetX(wxCoord x);
     void SetY(wxCoord y);
-    void SetPosition(wxPoint pos);
+    void SetPosition(const wxPoint& pos);
     
     void SetLeftDown(bool down);
     void SetMiddleDown(bool down);