diff --git a/docker-compose.mon-server.yml b/docker-compose.mon-server.yml
index 02dbb050..8c426e0b 100644
--- a/docker-compose.mon-server.yml
+++ b/docker-compose.mon-server.yml
@@ -43,7 +43,8 @@ services:
     labels:
       org.label-schema.group: "monitoring"
     network_mode: "service:wireguard"
-    depends_on: wireguard
+    depends_on:
+      - wireguard
 
       # DEBUG container wireguard
       #  alpine: