diff --git a/auth/ntlmssp/ntlmssp_client.c b/auth/ntlmssp/ntlmssp_client.c
index f99257d..071a3b0 100644
--- a/auth/ntlmssp/ntlmssp_client.c
+++ b/auth/ntlmssp/ntlmssp_client.c
@@ -132,7 +132,7 @@ NTSTATUS ntlmssp_client_challenge(struct gensec_security *gensec_security,
 		talloc_get_type_abort(gensec_security->private_data,
 				      struct gensec_ntlmssp_context);
 	struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
-	uint32_t chal_flags, ntlmssp_command, unkn1, unkn2;
+	uint32_t chal_flags, ntlmssp_command, unkn1 = 0, unkn2 = 0;
 	DATA_BLOB server_domain_blob;
 	DATA_BLOB challenge_blob;
 	DATA_BLOB target_info = data_blob(NULL, 0);
@@ -177,14 +177,14 @@ NTSTATUS ntlmssp_client_challenge(struct gensec_security *gensec_security,
 		if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
 			chal_parse_string = "CdUdbddB";
 		} else {
-			chal_parse_string = "CdUdbdd";
+			chal_parse_string = "CdUdb";
 		}
 		auth_gen_string = "CdBBUUUBd";
 	} else {
 		if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
 			chal_parse_string = "CdAdbddB";
 		} else {
-			chal_parse_string = "CdAdbdd";
+			chal_parse_string = "CdAdb";
 		}
 
 		auth_gen_string = "CdBBAAABd";