diff --git a/components/style/properties/gecko.mako.rs b/components/style/properties/gecko.mako.rs
index f1014308e22..769559b7c3d 100644
--- a/components/style/properties/gecko.mako.rs
+++ b/components/style/properties/gecko.mako.rs
@@ -425,7 +425,7 @@ impl ${style_struct.gecko_struct_name} {
     pub fn initial() -> Arc<Self> {
         let mut result = Arc::new(${style_struct.gecko_struct_name} { gecko: unsafe { zeroed() } });
         unsafe {
-            Gecko_Construct_${style_struct.gecko_ffi_name}(&mut Arc::make_mut(&mut result).gecko);
+            Gecko_Construct_${style_struct.gecko_ffi_name}(&mut Arc::get_mut(&mut result).unwrap().gecko);
         }
         result
     }