diff --git a/module.nix b/module.nix
index 53bb374..fbb6520 100644
--- a/module.nix
+++ b/module.nix
@@ -63,13 +63,15 @@ in {
         environment = {
           PRICEBOT_EXCHANGE_HOST = cfg.exchange-host;
           PRICEBOT_BEBOT_URL = cfg.mattermost-url;
-          PRICEBOT_BEBOT_AUTH_TOKEN_FILE = cfg.mattermost-auth-token-file;
+          PRICEBOT_BEBOT_AUTH_TOKEN_FILE = "%T/auth.token";
           PRICEBOT_BEBOT_CHANNEL_ID = opts.mattermost-channel-id;
           PRICEBOT_TARGET_CURRENCY = opts.currency;
           PRICEBOT_NOTIFY_USER = opts.notify-user;
         };
         serviceConfig = {
           ExecStart = "${pkgs.jre}/bin/java -jar ${pricebot-jar}";
+          ExecStartPre =
+            "/usr/bin/install --owner=%u --mode=400 -T ${cfg.mattermost-auth-token-file} %T/auth.token";
           DynamicUser = true;
           PrivateTmp = true;
           PrivateDevices = true;