diff --git a/AppKit/CPWindow/CPWindow.j b/AppKit/CPWindow/CPWindow.j
index a2dd7d717..103fc2890 100644
--- a/AppKit/CPWindow/CPWindow.j
+++ b/AppKit/CPWindow/CPWindow.j
@@ -567,7 +567,7 @@ CPTexturedBackgroundWindowMask
 */
 - (CGRect)frame
 {
-    return _frame;
+    return _CGRectMakeCopy(_frame);
 }
 
 /*!