diff --git a/src/rpc/rpcHandler.ts b/src/rpc/rpcHandler.ts
index 27741a4c..57f2f2bd 100644
--- a/src/rpc/rpcHandler.ts
+++ b/src/rpc/rpcHandler.ts
@@ -58,6 +58,7 @@ import type {
 import {
     calcPreVerificationGas,
     calcVerificationGasAndCallGasLimit,
+    deepHexlify,
     getAAError,
     getNonceKeyAndValue,
     getUserOperationHash,
@@ -557,7 +558,7 @@ export class RpcHandler implements IRpcEndpoint {
                 entryPoint,
                 queuedUserOperations,
                 false,
-                stateOverrides
+                deepHexlify(stateOverrides)
             )
         }