diff --git a/topologie/models.py b/topologie/models.py
index a49c6825..9667fdfe 100644
--- a/topologie/models.py
+++ b/topologie/models.py
@@ -36,7 +36,7 @@ class Port(models.Model):
             ('BLOQ', 'BLOQ'),
             ('COMMON', 'COMMON'),
             )
-    STATES = STATES_BASE + tuple([(id, id) for id in VLAN_ID_LIST])
+    STATES = STATES_BASE + tuple([(str(id), str(id)) for id in VLAN_ID_LIST])
 
     switch = models.ForeignKey('Switch', related_name="ports")
     port = models.IntegerField()