diff --git a/components/style/lib.rs b/components/style/lib.rs
index b82d2fd3cc0..e1453706977 100644
--- a/components/style/lib.rs
+++ b/components/style/lib.rs
@@ -171,7 +171,7 @@ pub mod gecko_properties {
 }
 
 macro_rules! reexport_computed_values {
-    ( $( $name: ident )+ ) => {
+    ( $( { $name: ident, $boxed: expr } )+ ) => {
         /// Types for [computed values][computed].
         ///
         /// [computed]: https://drafts.csswg.org/css-cascade/#computed
diff --git a/components/style/properties/properties.mako.rs b/components/style/properties/properties.mako.rs
index 0e11d2ac0ad..d6c6faf964d 100644
--- a/components/style/properties/properties.mako.rs
+++ b/components/style/properties/properties.mako.rs
@@ -3419,7 +3419,7 @@ macro_rules! longhand_properties_idents {
     ($macro_name: ident) => {
         $macro_name! {
             % for property in data.longhands:
-                ${property.ident}
+                { ${property.ident}, ${"true" if property.boxed else "false"} }
             % endfor
         }
     }