diff --git a/src/cache/inmemory/inMemoryCache.ts b/src/cache/inmemory/inMemoryCache.ts
index 48fb6dc4107..d085e83bdd3 100644
--- a/src/cache/inmemory/inMemoryCache.ts
+++ b/src/cache/inmemory/inMemoryCache.ts
@@ -3,6 +3,7 @@ import './fixPolyfills';
 
 import { DocumentNode } from 'graphql';
 import { OptimisticWrapperFunction, wrap } from 'optimism';
+import { equal } from '@wry/equality';
 
 import { ApolloCache, BatchOptions } from '../core/cache';
 import { Cache } from '../core/types/Cache';
@@ -499,7 +500,7 @@ export class InMemoryCache extends ApolloCache<NormalizedCacheObject> {
       }
     }
 
-    if (!lastDiff || lastDiff.result !== diff.result) {
+    if (!lastDiff || !equal(lastDiff.result, diff.result)) {
       c.callback(c.lastDiff = diff, lastDiff);
     }
   }