diff --git a/packages/relay-kit/test-utils/mockGetEip4337BundlerProvider.ts b/packages/relay-kit/test-utils/mockGetEip4337BundlerProvider.ts
index 43e2f1241..efaa71fae 100644
--- a/packages/relay-kit/test-utils/mockGetEip4337BundlerProvider.ts
+++ b/packages/relay-kit/test-utils/mockGetEip4337BundlerProvider.ts
@@ -1,4 +1,9 @@
 import sinon from 'sinon'
 import * as utils from '../src/packs/safe-4337/utils'
 
+Object.defineProperty(utils, 'getEip4337BundlerProvider', {
+  configurable: true,
+  writable: true
+})
+
 export const mockGetEip4337BundlerProvider = () => sinon.stub(utils, 'getEip4337BundlerProvider')