diff --git a/gestion/tools/locate-mac.py b/gestion/tools/locate-mac.py
index cb83c14b..1ad60527 100755
--- a/gestion/tools/locate-mac.py
+++ b/gestion/tools/locate-mac.py
@@ -25,7 +25,7 @@ class interroge_switch (threading.Thread) :
 
     def run (self) :
         sw = hpswitch(self.switch)
-        prise = sw.where_is_mac(mac)
+        prise = sw.where_is_mac(self.mac)
         if prise != None :
             self.tableau.append("%-10s => prise %-2s : %s" % (self.switch.encode('iso-8859-15').replace('.adm.crans.org',''), str(prise), sw.nom(None, prise)))