diff --git a/xpfe/appshell/src/nsWebShellWindow.cpp b/xpfe/appshell/src/nsWebShellWindow.cpp
index e3ae618e7d1..ed914ace8a2 100644
--- a/xpfe/appshell/src/nsWebShellWindow.cpp
+++ b/xpfe/appshell/src/nsWebShellWindow.cpp
@@ -2719,7 +2719,7 @@ NS_IMETHODIMP nsWebShellWindow::GetContentBounds(nsRect& aResult)
  
 NS_IMETHODIMP nsWebShellWindow::GetWindowBounds(nsRect& aResult)
 {
-   mWindow->GetBounds(aResult);
+   mWindow->GetScreenBounds(aResult);
    return NS_OK;
 }