diff --git a/src/osx/cocoa/window.mm b/src/osx/cocoa/window.mm
index 3eb68e4a2d..682ffa9f26 100644
--- a/src/osx/cocoa/window.mm
+++ b/src/osx/cocoa/window.mm
@@ -2476,6 +2476,8 @@ void wxWidgetCocoaImpl::SetLabel( const wxString& title, wxFontEncoding encoding
             [attrString endEditing];
 
             [(id)m_osxView setAttributedTitle:attrString];
+            
+            [attrString release];
 
             return;
         }