diff --git a/lc_ldap.py b/lc_ldap.py
index 6ca50e2..3bc5111 100644
--- a/lc_ldap.py
+++ b/lc_ldap.py
@@ -289,7 +289,7 @@ class CransLdapObject(object):
                 oldif = res[0][1]
                 nldif = cldif_to_ldif(self.attrs)
 
-                for attr, vals in oldif:
+                for attr, vals in oldif.items():
                     if nldif[attr] != vals:
                         for v in nldif[attr]:
                             if v in vals: