diff --git a/gestion/ldap_crans.py b/gestion/ldap_crans.py
index 1db5002e..5e26e545 100755
--- a/gestion/ldap_crans.py
+++ b/gestion/ldap_crans.py
@@ -187,7 +187,7 @@ def preattr(val):
         val = val.strip()
         return [len(val), val.encode('utf-8')]
     else:
-        raise TypeError
+        raise TypeError(type(val))
 
 def is_actif(sanction):
     """