diff --git a/mozilla/layout/xul/base/src/nsBoxFrame.cpp b/mozilla/layout/xul/base/src/nsBoxFrame.cpp
index e9b4fb77bc0..a662d46693a 100644
--- a/mozilla/layout/xul/base/src/nsBoxFrame.cpp
+++ b/mozilla/layout/xul/base/src/nsBoxFrame.cpp
@@ -1271,6 +1271,7 @@ nsBoxFrame::AttributeChanged(nsIPresContext* aPresContext,
         aAttribute == nsHTMLAtoms::top ||
         aAttribute == nsXULAtoms::flex ||
         aAttribute == nsXULAtoms::orient ||
+        aAttribute == nsXULAtoms::dir ||
         aAttribute == nsXULAtoms::equalsize ||
         aAttribute == nsXULAtoms::autostretch) {