diff --git a/src/types.ts b/src/types.ts
index f3730ae14..78f0c30e5 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -2421,7 +2421,7 @@ export class ZodObject<
   private _cached: { shape: T; keys: string[] } | null = null;
 
   _getCached(): { shape: T; keys: string[] } {
-    if (this._cached !== null) return this._cached;
+    if (this._cached) return this._cached;
     const shape = this._def.shape();
     const keys = util.objectKeys(shape);
     return (this._cached = { shape, keys });