diff --git a/src/types.ts b/src/types.ts
index c668737..24830a6 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -232,7 +232,8 @@ export type PaymasterClient<T extends Transport = HttpTransport> = Client<
   PaymasterActions
 >;
 
-export type OnChainUserOperation = UserOperation & {
+export type OnChainUserOperation = {
+  userOperation: UserOperation;
   blockHash: Hash;
   blockNumber: Hex;
   entryPoint: Address;