diff --git a/src/mac/carbon/bitmap.cpp b/src/mac/carbon/bitmap.cpp
index 2fbb7dd2f6..9915e71354 100644
--- a/src/mac/carbon/bitmap.cpp
+++ b/src/mac/carbon/bitmap.cpp
@@ -216,6 +216,7 @@ PicHandle wxMacCreatePicHandle( const wxBitmap &bmp )
         GWorldPtr monoworld ;
         clipRgn = NewRgn() ;
         OSStatus err = NewGWorld( &monoworld , 1 , &rect , NULL , NULL , 0 ) ;
+        verify_noerr(err) ;
         LockPixels( GetGWorldPixMap( monoworld ) ) ;
         LockPixels( GetGWorldPixMap( mask ) ) ;
         SetGWorld( monoworld , NULL ) ;
diff --git a/src/mac/carbon/renderer.cpp b/src/mac/carbon/renderer.cpp
index a739a49c57..685b8e1a68 100644
--- a/src/mac/carbon/renderer.cpp
+++ b/src/mac/carbon/renderer.cpp
@@ -135,8 +135,6 @@ wxRendererMac::DrawHeaderButton(wxWindow *win,
                                 const wxRect& rect,
                                 int flags)
 {
-    const int CORNER = 1;
-
     const wxCoord x = rect.x-1,
                   y = rect.y-1,
                   w = rect.width,