diff --git a/packages/std/__tests__/types/isObj.spec.ts b/packages/std/__tests__/types/isObj.spec.ts
index f630d27..554e8a3 100644
--- a/packages/std/__tests__/types/isObj.spec.ts
+++ b/packages/std/__tests__/types/isObj.spec.ts
@@ -37,7 +37,6 @@ describe('Types > isObj', () => {
         this.name = name;
       }
     }
-
     expect(isObj(new Person('x'))).toBe(false);
     expect(isObj(new (fun as any)(1))).toBe(false);
   });
@@ -47,5 +46,14 @@ describe('Types > isObj', () => {
     expect(isObj({ a: 1 })).toBe(true);
     expect(isObj(new Object())).toBe(true);
     expect(isObj(Object.create(null))).toBe(true);
+
+    if (globalThis.structuredClone) {
+      const obj = {
+        a: 1,
+        b: 'Hello world',
+      };
+      const clone = structuredClone(obj);
+      expect(isObj(structuredClone(obj))).toBe(true);
+    }
   });
 });
diff --git a/packages/std/src/types/isObj.ts b/packages/std/src/types/isObj.ts
index df145f8..b433d6b 100644
--- a/packages/std/src/types/isObj.ts
+++ b/packages/std/src/types/isObj.ts
@@ -18,5 +18,5 @@ export default function isObj(val: unknown): val is object {
 
   const p = Object.getPrototypeOf(val);
 
-  return p === null || p === Object.prototype;
+  return p === null || Object.getPrototypeOf(p) === null;
 }