diff --git a/input/grid5000/sites/nancy/clusters/grisou/nodes/grisou-28.yaml b/input/grid5000/sites/nancy/clusters/grisou/nodes/grisou-28.yaml
index 77470aabb6417ff8b03070548e71d2ee86767836..3ce9cd26b1ae585281fe0d5a236a04ed194f092d 100644
--- a/input/grid5000/sites/nancy/clusters/grisou/nodes/grisou-28.yaml
+++ b/input/grid5000/sites/nancy/clusters/grisou/nodes/grisou-28.yaml
@@ -78,7 +78,7 @@ grisou-28:
       driver: igb
       firmware_version: 1.67, 0x80000fab, 18.8.9
       interface: Ethernet
-      mac: e4:43:4b:21:59:4D
+      mac: e4:43:4b:21:59:4d
       management: false
       model: I350 Gigabit Network Connection
       name: eno4