diff --git a/utils/he_ipv6/tunnelbroker.py b/utils/he_ipv6/tunnelbroker.py
index 2677aa6..389f764 100644
--- a/utils/he_ipv6/tunnelbroker.py
+++ b/utils/he_ipv6/tunnelbroker.py
@@ -153,8 +153,8 @@ class TunnelBroker(object):
                              family = socket.AF_INET6)
                     logger.debug('Added {0} with prefix {1} to {2}.'.format(a.str, a.prefix, assignment.iface))
                 except Exception as e:
-                    logger.error(('Could not add address {0} on link {1}: '
-                                  '{2}').format(a.str, assignment.iface_idx, e))
+                    logger.error(('Could not add address {0} on {1}: '
+                                  '{2}').format(a.str, assignment.iface, e))
                     ipr.close()
                     raise e
             # The SLAAC prefixes.
@@ -167,8 +167,8 @@ class TunnelBroker(object):
                              family = socket.AF_INET6)
                     logger.debug('Added {0} with prefix {1} to {2}.'.format(b.str, b.prefixlen, assignment.iface))
                 except Exception as e:
-                    logger.error(('Could not add address block {0} on link {1}: '
-                                  '{2}').format(b.str, assignment.iface_idx, e))
+                    logger.error(('Could not add address block {0} on {1}: '
+                                  '{2}').format(b.str, assignment.iface, e))
                     ipr.close()
                     raise e
         ipr.close()