diff --git a/testnet/validator.go b/testnet/validator.go
index c50970d1e..de21a88f7 100644
--- a/testnet/validator.go
+++ b/testnet/validator.go
@@ -406,7 +406,8 @@ func (v *Validator) buildDelegateKeysMsg() sdktypes.Msg {
 	}
 
 	signMsgBz := marshaller.MustMarshalBinaryBare(&signMsg)
-	ethSig, err := gravitytypes.NewEthereumSignature(signMsgBz, privKey)
+	hash := crypto.Keccak256Hash(signMsgBz).Bytes()
+	ethSig, err := gravitytypes.NewEthereumSignature(hash, privKey)
 	if err != nil {
 		panic(fmt.Sprintf("failed to create Ethereum signature: %s", err))
 	}