diff --git a/core/src/avm1/object/xml_idmap_object.rs b/core/src/avm1/object/xml_idmap_object.rs
index 744984009..78fc82ae7 100644
--- a/core/src/avm1/object/xml_idmap_object.rs
+++ b/core/src/avm1/object/xml_idmap_object.rs
@@ -185,12 +185,12 @@ impl<'gc> TObject<'gc> for XmlIdMapObject<'gc> {
             .set_attributes(gc_context, name, set_attributes, clear_attributes)
     }
 
-    fn proto(&self) -> Option<Object<'gc>> {
-        self.base().proto()
+    fn proto_value(&self) -> Value<'gc> {
+        self.base().proto_value()
     }
 
-    fn set_proto(&self, gc_context: MutationContext<'gc, '_>, prototype: Option<Object<'gc>>) {
-        self.base().set_proto(gc_context, prototype);
+    fn set_proto_value(&self, gc_context: MutationContext<'gc, '_>, prototype: Value<'gc>) {
+        self.base().set_proto_value(gc_context, prototype);
     }
 
     fn has_property(&self, activation: &mut Activation<'_, 'gc, '_>, name: &str) -> bool {