diff --git a/input/grid5000/sites/nancy/clusters/grisou/grisou.yaml.erb b/input/grid5000/sites/nancy/clusters/grisou/grisou.yaml.erb
index 02fb8eb43df52e17044c6d946a47be230df4d841..c0ea0420f926aa37d587f45e482e3e45941358ed 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
-                    F4-8E-38-CB-46-40
+                    F4:8E:38:CB:46:40
                     64:00:6a:c0:dc:a6
                     64:00:6a:c0:dc:12
                     64:00:6a:c0:e4:4c