diff --git a/widget/src/mac/nsMacWindow.cpp b/widget/src/mac/nsMacWindow.cpp
index 383dff4c2a39..2e867c508264 100644
--- a/widget/src/mac/nsMacWindow.cpp
+++ b/widget/src/mac/nsMacWindow.cpp
@@ -804,7 +804,7 @@ NS_IMETHODIMP nsMacWindow::Show(PRBool aState)
   if (aState && !mBounds.IsEmpty()) {
     if (mIsSheet) {
       if (parentWindowRef) {
-        WindowPtr top = GetWindowTop(parentWindowRef);
+        WindowPtr top = parentWindowRef;
         if (piParentWidget) {
           piParentWidget->SetIgnoreDeactivate(PR_TRUE);