diff --git a/base/univention-system-setup/umc/python/setup/netconf/modules/SaveOldApplianceAddress.py b/base/univention-system-setup/umc/python/setup/netconf/modules/SaveOldApplianceAddress.py
index f66a1225d5..56ebb0891e 100644
--- a/base/univention-system-setup/umc/python/setup/netconf/modules/SaveOldApplianceAddress.py
+++ b/base/univention-system-setup/umc/python/setup/netconf/modules/SaveOldApplianceAddress.py
@@ -19,6 +19,7 @@ class PhaseSaveOldApplianceAddress(AddressChange):
 		for name, iface in self.changeset.old_interfaces.ipv4_interfaces:
 			if ':' in name:
 				self.logger.info("Skipping %s...", name)
+				continue
 			ipv4 = iface.ipv4_address().ip
 			if ipv4 not in new_ipv4s:
 				self.rewrite(name, iface)