diff --git a/host-pottwal.yml b/host-pottwal.yml
index b190836..45c9764 100644
--- a/host-pottwal.yml
+++ b/host-pottwal.yml
@@ -158,8 +158,8 @@
         restart_policy: unless-stopped
         env:
           TZ: "{{ timezone }}"
-          SERVER_PORT=80
-          SERVER_ROOT=/public
+          SERVER_PORT: "80"
+          SERVER_ROOT: "/public"
         ports:
           - "127.0.0.1:{{ jabber_host_port }}:80"
         volumes: