diff --git a/src/osx/cocoa/toolbar.mm b/src/osx/cocoa/toolbar.mm
index ccc6bbaf43..57c8989ccd 100644
--- a/src/osx/cocoa/toolbar.mm
+++ b/src/osx/cocoa/toolbar.mm
@@ -516,7 +516,7 @@ void wxToolBarTool::UpdateImages()
         dc.SelectObject( m_alternateBitmap );
         dc.SetPen( wxPen(*wxBLACK) );
         dc.SetBrush( wxBrush( *wxLIGHT_GREY ));
-        dc.DrawRectangle( 0, 0, w, h );
+        dc.DrawRoundedRectangle( 0, 0, w, h, 2 );
         dc.DrawBitmap( m_bmpNormal, 0, 0, true );
         dc.SelectObject( wxNullBitmap );