diff --git a/core/runtime/src/impl/EggObjectUtil.ts b/core/runtime/src/impl/EggObjectUtil.ts
index c702448a..d9c23b36 100644
--- a/core/runtime/src/impl/EggObjectUtil.ts
+++ b/core/runtime/src/impl/EggObjectUtil.ts
@@ -10,7 +10,7 @@ export class EggObjectUtil {
       get(): any {
         return eggObject.obj;
       },
-      configurable: false,
+      configurable: true,
       enumerable: true,
     };
   }
@@ -22,7 +22,7 @@ export class EggObjectUtil {
           const eggObject = EggContainerFactory.getEggObject(proto, objName);
           return eggObject.obj;
         },
-        configurable: false,
+        configurable: true,
         enumerable: true,
       };
     }
diff --git a/core/runtime/test/EggObject.test.ts b/core/runtime/test/EggObject.test.ts
index d0863dca..6ce2f003 100644
--- a/core/runtime/test/EggObject.test.ts
+++ b/core/runtime/test/EggObject.test.ts
@@ -4,6 +4,7 @@ import { EggTestContext } from './fixtures/EggTestContext';
 import TestUtil from './util';
 import { EggContainerFactory } from '..';
 import { Foo, Bar } from './fixtures/modules/lifecycle-hook/object';
+import { Bar as ExtendsBar } from './fixtures/modules/extends-module/Base';
 import mm from 'mm';
 import { ContextHandler } from '../src/model/ContextHandler';
 import { SingletonBar } from './fixtures/modules/inject-context-to-singleton/object';
@@ -101,4 +102,25 @@ describe('test/EggObject.test.ts', () => {
       await ctx.destroy({});
     });
   });
+
+  describe('property mock', () => {
+    beforeEach(() => {
+      mm(ContextHandler, 'getContext', () => {
+        return ctx;
+      });
+    });
+
+    it('should work', async () => {
+      const instance = await TestUtil.createLoadUnitInstance('extends-module');
+      const barProto = EggPrototypeFactory.instance.getPrototype('bar', instance.loadUnit);
+      const barObj = await EggContainerFactory.getOrCreateEggObject(barProto, barProto.name);
+      const bar = barObj.obj as ExtendsBar;
+      const foo = {};
+      mm(bar, 'foo', foo);
+      assert(bar.foo === foo);
+
+      await TestUtil.destroyLoadUnitInstance(instance);
+      await ctx.destroy({});
+    });
+  });
 });