diff --git a/modules/moodle-dl.nix b/modules/moodle-dl.nix
index ca1c60f..1392988 100644
--- a/modules/moodle-dl.nix
+++ b/modules/moodle-dl.nix
@@ -81,7 +81,7 @@ in {
           Group = config.users.groups.moodle-dl.name;
           WorkingDirectory = cfg.directory;
           ExecStart = "${cfg.package}/bin/moodle-dl ${lib.optionalString cfg.notifyOnly "--without-downloading-files"}";
-          ExecStartPre = "${pkgs.jq}/bin/jq -s '.[0] *.[1]' ${toString moodle-dl-json} ${toString cfg.tokensFile} > ${cfg.directory}/config.json";
+          ExecStartPre = pkgs.writers.writeDash "moodle-dl-config" "${pkgs.jq}/bin/jq -s '.[0] * .[1]' ${toString moodle-dl-json} ${toString cfg.tokensFile} > ${cfg.directory}/config.json";
         }
         (mkIf (cfg.directory == stateDirectoryDefault) {StateDirectory = "moodle-dl";})
       ];