diff --git a/include/wx/mac/icon.h b/include/wx/mac/icon.h
index 512e95e88f..e24b58316e 100644
--- a/include/wx/mac/icon.h
+++ b/include/wx/mac/icon.h
@@ -31,7 +31,7 @@ public:
 
   wxIcon(const char **data);
   wxIcon(char **data);
-  wxIcon(const char bits[], int width=-1, int height=-1);
+  wxIcon(const char bits[], int width , int height );
   wxIcon(const wxString& name, long flags = wxBITMAP_TYPE_ICON_RESOURCE,
     int desiredWidth = -1, int desiredHeight = -1);
   ~wxIcon();