diff --git a/AppKit/CPApplication.j b/AppKit/CPApplication.j
index 7958fc45f..ad729b0f5 100644
--- a/AppKit/CPApplication.j
+++ b/AppKit/CPApplication.j
@@ -861,6 +861,7 @@ CPRunContinuesResponse  = -1002;
     }
 
     [aWindow orderFront:self];
+    [aSheet setPlatformWindow:[aWindow platformWindow]];
     [aWindow _attachSheet:aSheet modalDelegate:aModalDelegate didEndSelector:aDidEndSelector contextInfo:aContextInfo];
 }