1 files changed, 1 insertions, 1 deletions
diff --git a/components/style/properties/helpers/animated_properties.mako.rs b/components/style/properties/helpers/animated_properties.mako.rs
index 3874f972a25..99b2cc377f6 100644
--- a/components/style/properties/helpers/animated_properties.mako.rs
+++ b/components/style/properties/helpers/animated_properties.mako.rs
@@ -582,7 +582,7 @@ impl AnimationValue {
                             &variables.url_data,
                             variables.from_shorthand,
                             &custom_props,
-                            |v| {
+                            &mut |v| {
                                 let declaration = match *v {
                                     DeclaredValue::Value(value) => {
                                         PropertyDeclaration::${prop.camel_case}(value.clone())