diff --git a/mozilla/widget/src/motif/nsWindow.h b/mozilla/widget/src/motif/nsWindow.h
index 98cabc9aa30..6be2c36b0da 100644
--- a/mozilla/widget/src/motif/nsWindow.h
+++ b/mozilla/widget/src/motif/nsWindow.h
@@ -137,6 +137,7 @@ protected:
   nscolor     mForeground;
   nsCursor    mCursor;
   nsBorderStyle mBorderStyle;
+  nsRect      mBounds;
 
 };