diff --git a/rootfs/etc/confd/templates/config.yaml.tmpl b/rootfs/etc/confd/templates/config.yaml.tmpl
index e398de4..cba62fd 100644
--- a/rootfs/etc/confd/templates/config.yaml.tmpl
+++ b/rootfs/etc/confd/templates/config.yaml.tmpl
@@ -24,7 +24,7 @@ appservice:
     address: http://{{getenv "HOSTNAME"}}:29318
 
     # The hostname and port where this appservice should listen.
-    hostname: [::]
+    hostname: "[::]"
     port: 29318
 
     # Database config.