diff --git a/gestion/hptools.py b/gestion/hptools.py
index fb9b906e..634e3838 100644
--- a/gestion/hptools.py
+++ b/gestion/hptools.py
@@ -408,7 +408,7 @@ class sw_chbre(hpswitch) :
 	    else :
 		self.prise = int(prise[1:])
 	except :
-	    raise ValueError('Chambre inconnue')
+	    raise ValueError('Chambre %s inconnue' % chbre)
 	
 	# Config snmp
 	self.get, self.set, self.walk = config_snmp_secrete(snmp,self.switch)