diff --git a/device-types/Fortinet/FG-40F.yaml b/device-types/Fortinet/FG-40F.yaml
index 08c429dbc..be62022bc 100644
--- a/device-types/Fortinet/FG-40F.yaml
+++ b/device-types/Fortinet/FG-40F.yaml
@@ -14,13 +14,13 @@ power-ports:
     maximum_draw: 14
     allocated_draw: 12
 interfaces:
-  - name: wan1
+  - name: wan
     type: 1000base-t
   - name: A
     type: 1000base-t
-  - name: internal1
+  - name: lan1
     type: 1000base-t
-  - name: internal2
+  - name: lan2
     type: 1000base-t
-  - name: internal3
+  - name: lan3
     type: 1000base-t