diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
index af0ec2d5ad0e9da25af4ec8528266451a42cc8b5..c3d086e2bd569bcdfbd565b68d5759a2817772e9 100644
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -430,7 +430,7 @@ int build_ntlmssp_auth_blob(unsigned char *pbuffer,
 	} else {
 		int len;
 		len = cifs_strtoUTF16((__le16 *)tmp, ses->domainName,
-				      CIFS_MAX_USERNAME_LEN, nls_cp);
+				      CIFS_MAX_DOMAINNAME_LEN, nls_cp);
 		len *= 2; /* unicode is 2 bytes each */
 		sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
 		sec_blob->DomainName.Length = cpu_to_le16(len);