diff --git a/data/grid5000/sites/nancy/clusters/grisou/nodes/grisou-17.json b/data/grid5000/sites/nancy/clusters/grisou/nodes/grisou-17.json
index 0c9bfcec1e3fed6cbc7d93fdb60363e0ce6bfbc4..056fc8e17c632c8ca6228b1a7fdff7a7cece7938 100644
--- a/data/grid5000/sites/nancy/clusters/grisou/nodes/grisou-17.json
+++ b/data/grid5000/sites/nancy/clusters/grisou/nodes/grisou-17.json
@@ -214,7 +214,7 @@
       "interface": "Ethernet",
       "ip": "172.17.72.17",
       "kavlan": false,
-      "mac": "64:00:6a:c0:e4:34",
+      "mac": "f4-8e-38-cb-46-40",
       "management": true,
       "mountable": false,
       "mounted": false,
diff --git a/input/grid5000/sites/nancy/clusters/grisou/grisou.yaml.erb b/input/grid5000/sites/nancy/clusters/grisou/grisou.yaml.erb
index 55a6e3d50bf171707fd8295588f408ee0ef9f3ab..02fb8eb43df52e17044c6d946a47be230df4d841 100644
--- a/input/grid5000/sites/nancy/clusters/grisou/grisou.yaml.erb
+++ b/input/grid5000/sites/nancy/clusters/grisou/grisou.yaml.erb
@@ -84,7 +84,7 @@ nodes:
                     64:00:6a:c0:dd:70
                     64:00:6a:c0:dd:2c
                     64:00:6a:c0:e4:1e
-                    64:00:6a:c0:e4:34
+                    F4-8E-38-CB-46-40
                     64:00:6a:c0:dc:a6
                     64:00:6a:c0:dc:12
                     64:00:6a:c0:e4:4c