diff --git a/gestion/locate-mac.py b/gestion/locate-mac.py
index 16476a5d..a7b9820f 100755
--- a/gestion/locate-mac.py
+++ b/gestion/locate-mac.py
@@ -8,4 +8,7 @@ from sys import argv
 
 for switch in ['backbone'] + all_switchs():
     prise = hpswitch(switch).where_is_mac(argv[1])
-    print "%-10s: %d" % (switch, prise)
+    if prise != None:
+        print "%-10s: %d" % (switch, prise)
+    else:
+        print "%-10s: non trouvé" % switch