diff --git a/ntlm/ntlmv2.go b/ntlm/ntlmv2.go
index efadeea..007b952 100644
--- a/ntlm/ntlmv2.go
+++ b/ntlm/ntlmv2.go
@@ -246,7 +246,7 @@ func (n *V2ServerSession) ProcessAuthenticateMessage(am *AuthenticateMessage) (e
 		return err
 	}
 
-	hexServerChallenge := hex.EncodeToString(n.challengeMessage.ServerChallenge)
+	hexServerChallenge := string(n.serverChallenge)
 	hexNTLMClienteChallenge := hex.EncodeToString(n.ntChallengeResponse)
 	hexClientChallenge := hex.EncodeToString(n.clientChallenge)