diff --git a/gestion/config.py b/gestion/config.py
index db1edc6a..732bdd72 100644
--- a/gestion/config.py
+++ b/gestion/config.py
@@ -381,7 +381,7 @@ NETs = { 'serveurs' : [ '138.231.136.0/28' ],
                            '138.231.147.0/24', '138.231.149.0/24', '138.231.150.0/24', '138.231.151.0/24' ],
          'fil' : [ '138.231.136.0/21' ],
          'wifi': [ '138.231.144.0/21' ],
-         'gratuit': [ '10.42.0.0/16' ],
+         'gratuit': [ '10.42.0.0/21' ],
          'personnel-ens': ['10.2.9.0/24' ],
          'ens' : ['138.231.135.0/24'],
          'all' : [ '138.231.136.0/21', '138.231.148.0/21' ]