diff --git a/gestion/locate-mac.py b/gestion/locate-mac.py
index 32dc6ad8..ac50c0ae 100755
--- a/gestion/locate-mac.py
+++ b/gestion/locate-mac.py
@@ -6,9 +6,11 @@ from annuaires import reverse, all_switchs
 from hptools import hpswitch
 from sys import argv
 
+mac = ":".join([i.zfill(2) for i in argv[1].split(":")]).lower()
+
 for switch in ['backbone'] + all_switchs():
     sw = hpswitch(switch)
-    prise = sw.where_is_mac(argv[1])
+    prise = sw.where_is_mac(mac)
     if prise != None:
         print "%-10s: %d (%s)" % (switch, prise, sw.nom(None, prise))
     else: