diff --git a/content/reference/compose-file/services.md b/content/reference/compose-file/services.md
index 4901cf9a6b..609bc5649b 100644
--- a/content/reference/compose-file/services.md
+++ b/content/reference/compose-file/services.md
@@ -1648,7 +1648,7 @@ services:
         target: server.cert
         uid: "103"
         gid: "103"
-        mode: 0440
+        mode: "0440"
 secrets:
   server-certificate:
     file: ./server.cert