diff --git a/attributs.py b/attributs.py
index 7054303..319770f 100644
--- a/attributs.py
+++ b/attributs.py
@@ -561,7 +561,7 @@ class ip6HostNumber(Attr):
     can_modify = [nounou]
 
     def parse_value(self, ip6):
-        ip = ip6_of_mac(self.parent['macAddress'][0], int(self.parent['rid'][0]))
+        ip = ip6_of_mac(str(self.parent['macAddress'][0]), int(str(self.parent['rid'][0])))
         self.value = netaddr.ip.IPAddress(ip)
 
     def __unicode__(self):