diff --git a/data/grid5000/sites/nancy/servers/srv4.json b/data/grid5000/sites/nancy/servers/srv4.json
index f45df3ea3f8bc82bc0f5701f612abe682a61c98e..1c44e40d5baf8e893eda8ecae354878d41f4518d 100644
--- a/data/grid5000/sites/nancy/servers/srv4.json
+++ b/data/grid5000/sites/nancy/servers/srv4.json
@@ -6,11 +6,11 @@
     },
     "bmc": {
       "ip": "172.17.79.38",
-      "mac": "5E:ED:8C:39:37:F0"
+      "mac": "5c:ed:8c:39:37:f0"
     },
     "default": {
       "ip": "172.16.79.37",
-      "mac": "30:3E:A7:00:C8:28"
+      "mac": "30:3e:a7:00:c8:28"
     }
   },
   "pdu": [
diff --git a/input/grid5000/sites/nancy/servers/servers.yaml b/input/grid5000/sites/nancy/servers/servers.yaml
index 9f131f5e1596433ac5f94e95e1f31884aeae24fd..ac5d923e1a0262e79e1035f1e8ae2353a87868d2 100644
--- a/input/grid5000/sites/nancy/servers/servers.yaml
+++ b/input/grid5000/sites/nancy/servers/servers.yaml
@@ -287,13 +287,13 @@ srv4:
   serial: CZJ24220C6
   network_adapters:
     default:
-      mac: 30:3E:A7:00:C8:28
+      mac: 30:3e:a7:00:c8:28
       ip: 172.16.79.37
     adm:
       ip: 172.17.79.37
     bmc:
       ip: 172.17.79.38
-      mac: 5E:ED:8C:39:37:F0
+      mac: 5c:ed:8c:39:37:f0
   pdu:
     - uid: gruss-pdu1
       port: 6