diff --git a/packages/notifier/src/storesub.js b/packages/notifier/src/storesub.js
index 1068fa3379a..5dcfd3e2781 100644
--- a/packages/notifier/src/storesub.js
+++ b/packages/notifier/src/storesub.js
@@ -140,10 +140,11 @@ export const makeStoredSubscription = (
 
   /** @type {StoredSubscription<T>} */
   const storesub = Far('StoredSubscription', {
-    // @ts-expect-error getStoreKey type does not have `subscription`
     getStoreKey: async () => {
       if (!storageNode) {
-        return harden({ subscription });
+        return /** @type {Awaited<ReturnType<StoredSubscription<T>['getStoreKey']>>} */ (
+          harden({ subscription })
+        );
       }
       const storeKey = await E(storageNode).getStoreKey();
       return harden({ ...storeKey, subscription });
diff --git a/packages/notifier/src/types-ambient.js b/packages/notifier/src/types-ambient.js
index c0e7c40db34..8d6a9c36722 100644
--- a/packages/notifier/src/types-ambient.js
+++ b/packages/notifier/src/types-ambient.js
@@ -317,11 +317,7 @@
  * identifies children by restricted ASCII name and is associated with arbitrary
  * string-valued data for each node, defaulting to the empty string.
  *
- * @typedef {object} StorageNode
- * @property {(data: string) => Promise<void>} setValue publishes some data (append to the node)
- * @property {() => string} getPath the chain storage path at which the node was constructed
- * @property {() => Promise<VStorageKey>} getStoreKey DEPRECATED use getPath
- * @property {(subPath: string, options?: {sequence?: boolean}) => StorageNode} makeChildNode
+ * @typedef {import('@agoric/internal/src/lib-chainStorage').StorageNode} StorageNode
  */
 
 /**
diff --git a/packages/notifier/tools/testSupports.js b/packages/notifier/tools/testSupports.js
index f1eceb40db7..4adfc808edd 100644
--- a/packages/notifier/tools/testSupports.js
+++ b/packages/notifier/tools/testSupports.js
@@ -28,6 +28,9 @@ export const makeFakeStorage = (path, publication) => {
         publication.updateState(value);
       }
     },
+    delete: async () => {
+      throw Error('not implemented');
+    },
     makeChildNode: () => storage,
     countSetValueCalls: () => setValueCalls,
   });