1 files changed, 3 insertions, 2 deletions
diff --git a/src/new_fields/ObjectField.ts b/src/new_fields/ObjectField.ts
index 0f3777af6..f276bfa67 100644
--- a/src/new_fields/ObjectField.ts
+++ b/src/new_fields/ObjectField.ts
@@ -1,12 +1,13 @@
 import { Doc } from "./Doc";
+import { RefField } from "./RefField";
 
 export const OnUpdate = Symbol("OnUpdate");
 export const Parent = Symbol("Parent");
 export const Copy = Symbol("Copy");
 
 export abstract class ObjectField {
-    protected [OnUpdate]?: (diff?: any) => void;
-    private [Parent]?: Doc;
+    protected [OnUpdate](diff?: any) { };
+    private [Parent]?: RefField | ObjectField;
     abstract [Copy](): ObjectField;
 }