diff --git a/mylib/ldap.py b/mylib/ldap.py
index 1b7daeb..74dd0e5 100644
--- a/mylib/ldap.py
+++ b/mylib/ldap.py
@@ -705,6 +705,7 @@ class LdapClient:
         attrs = dict(
             (attr, self.encode(values))
             for attr, values in attrs.items()
+            if attr != 'dn'
         )
         try:
             if self._just_try: