diff --git a/components/style/properties/longhands/border.mako.rs b/components/style/properties/longhands/border.mako.rs
index 1066dbbc619..09e5abc00b6 100644
--- a/components/style/properties/longhands/border.mako.rs
+++ b/components/style/properties/longhands/border.mako.rs
@@ -111,7 +111,6 @@ ${helpers.predefined_type(
     vector=False,
     animation_value_type="discrete",
     flags="APPLIES_TO_FIRST_LETTER",
-    boxed=True,
 )}
 
 ${helpers.predefined_type(