diff --git a/wxPython/src/_sizers.i b/wxPython/src/_sizers.i
index 5084609c1e..9b4db7b3f9 100644
--- a/wxPython/src/_sizers.i
+++ b/wxPython/src/_sizers.i
@@ -290,7 +290,7 @@ public:
 
 
     void SetDimension( int x, int y, int width, int height );
-    void SetMinSize(wxSize size);
+    void SetMinSize( const wxSize &size );
 
     wxSize GetSize();
     wxPoint GetPosition();