diff --git a/src/cache/inmemory/inMemoryCache.ts b/src/cache/inmemory/inMemoryCache.ts
index fe7eb284bdd..896847bb6d6 100644
--- a/src/cache/inmemory/inMemoryCache.ts
+++ b/src/cache/inmemory/inMemoryCache.ts
@@ -28,6 +28,7 @@ import {
   TypePolicies,
 } from './policies';
 import { hasOwn } from './helpers';
+import { resetStringifyCanon } from './object-canon';
 
 export interface InMemoryCacheConfig extends ApolloReducerConfig {
   resultCaching?: boolean;
@@ -262,6 +263,7 @@ export class InMemoryCache extends ApolloCache<NormalizedCacheObject> {
 
   // Request garbage collection of unreachable normalized entities.
   public gc() {
+    resetStringifyCanon();
     return this.optimisticData.gc();
   }
 
@@ -322,6 +324,7 @@ export class InMemoryCache extends ApolloCache<NormalizedCacheObject> {
   public reset(): Promise<void> {
     this.init();
     this.broadcastWatches();
+    resetStringifyCanon();
     return Promise.resolve();
   }
 
diff --git a/src/cache/inmemory/object-canon.ts b/src/cache/inmemory/object-canon.ts
index 84c7c008cd6..a933b36a280 100644
--- a/src/cache/inmemory/object-canon.ts
+++ b/src/cache/inmemory/object-canon.ts
@@ -194,7 +194,10 @@ type SortedKeysInfo = {
   json: string;
 };
 
-const stringifyCanon = new ObjectCanon;
+let stringifyCanon = new ObjectCanon;
+export function resetStringifyCanon() {
+  stringifyCanon = new ObjectCanon;
+}
 const stringifyCache = new WeakMap<object, string>();
 
 // Since the keys of canonical objects are always created in lexicographically