diff --git a/management/univention-directory-manager-modules/modules/univention/admin/handlers/networks/network.py b/management/univention-directory-manager-modules/modules/univention/admin/handlers/networks/network.py
index fcc393d..0c74449 100644
--- a/management/univention-directory-manager-modules/modules/univention/admin/handlers/networks/network.py
+++ b/management/univention-directory-manager-modules/modules/univention/admin/handlers/networks/network.py
@@ -285,12 +285,11 @@ def _ldap_modlist(self):
 					raise univention.admin.uexceptions.rangeInBroadcastAddress('%s-%s' % (firstIP, lastIP, ))
 				ipRange.append(string.join(i, ' '))
 			univention.debug.debug(univention.debug.ADMIN, univention.debug.INFO, 'old Range: %s' % self.oldinfo.get('ipRange'))
+			ml = [x for x in ml if x[0] != 'univentionIpRange']
 			ml.append(('univentionIpRange', self.oldattr.get('univentionIpRange', ['']), ipRange))
 
 		if next_ip_changed:
-			for el in ml:  # mapping may have set nextIp already, we want our value
-				if el[0] == 'univentionNextIp':
-					ml.remove(el)
+			ml = [x for x in ml if x[0] != 'univentionNextIp']
 			ml.append(('univentionNextIp', self.oldattr.get('univentionNextIp', ''), self['nextIp']))
 
 		return ml