diff --git a/modules/4337/test/erc4337/Safe4337Module.spec.ts b/modules/4337/test/erc4337/Safe4337Module.spec.ts
index 1233e7f9..fad7b89b 100644
--- a/modules/4337/test/erc4337/Safe4337Module.spec.ts
+++ b/modules/4337/test/erc4337/Safe4337Module.spec.ts
@@ -293,7 +293,7 @@ describe('Safe4337Module', () => {
       const safeOpHash = calculateSafeOperationHash(await validator.getAddress(), safeOp, await chainId())
       const userOp = buildPackedUserOperationFromSafeUserOperation({
         safeOp,
-        signature: "0x",
+        signature: '0x',
       })
       const packedValidationData = packValidationData(1, validUntil, validAfter)
       const entryPointImpersonator = await ethers.getSigner(await entryPoint.getAddress())