diff --git a/layout/style/nsCSSPropList.h b/layout/style/nsCSSPropList.h
index ea717c40df..b97038f75a 100644
--- a/layout/style/nsCSSPropList.h
+++ b/layout/style/nsCSSPropList.h
@@ -1271,7 +1271,8 @@ CSS_PROP_SHORTHAND(
     border_width,
     BorderWidth,
     CSS_PROPERTY_PARSE_FUNCTION |
-        CSS_PROPERTY_UNITLESS_LENGTH_QUIRK,
+        CSS_PROPERTY_UNITLESS_LENGTH_QUIRK |
+        CSS_PROPERTY_GETCS_NEEDS_LAYOUT_FLUSH,
     "")
 CSS_PROP_POSITION(
     bottom,