diff --git a/src/cloudron.js b/src/cloudron.js
index 50e9c9687..53373387b 100644
--- a/src/cloudron.js
+++ b/src/cloudron.js
@@ -153,14 +153,14 @@ function isRebootRequired(callback) {
 }
 
 // called from cron.js
-function runSystemChecks() {
+function runSystemChecks(callback) {
+    assert.strictEqual(typeof callback, 'function');
+
     async.parallel([
         checkBackupConfiguration,
         checkMailStatus,
         checkRebootRequired
-    ], function (error) {
-        debug('runSystemChecks: done', error);
-    });
+    ], callback);
 }
 
 function checkBackupConfiguration(callback) {
diff --git a/src/cron.js b/src/cron.js
index 51db377b3..8241b2ae2 100644
--- a/src/cron.js
+++ b/src/cron.js
@@ -107,7 +107,7 @@ function recreateJobs(tz) {
     if (gJobs.systemChecks) gJobs.systemChecks.stop();
     gJobs.systemChecks = new CronJob({
         cronTime: '00 30 * * * *', // every 30 minutes. if you change this interval, change the notification messages with correct duration
-        onTick: cloudron.runSystemChecks,
+        onTick: () => cloudron.runSystemChecks(NOOP_CALLBACK),
         start: true,
         timeZone: tz
     });