diff --git a/module.nix b/module.nix
index 24feb1d..8ef70ed 100644
--- a/module.nix
+++ b/module.nix
@@ -71,7 +71,7 @@ in {
         serviceConfig = {
           ExecStart = "${pkgs.jre}/bin/java -jar ${pricebot-jar}";
           ExecStartPre =
-            "${pkgs.coreutils-full}/bin/install --owner=%u --mode=400 -T ${cfg.mattermost-auth-token-file} %T/auth.token";
+            "+${pkgs.coreutils-full}/bin/install --owner=%u --mode=400 -T ${cfg.mattermost-auth-token-file} %T/auth.token";
           DynamicUser = true;
           PrivateTmp = true;
           PrivateDevices = true;