diff --git a/src/Bundle/ChillMainBundle/Cron/CronManager.php b/src/Bundle/ChillMainBundle/Cron/CronManager.php
index 1438f3ec5..8cef52438 100644
--- a/src/Bundle/ChillMainBundle/Cron/CronManager.php
+++ b/src/Bundle/ChillMainBundle/Cron/CronManager.php
@@ -19,7 +19,7 @@ use Exception;
 use Psr\Log\LoggerInterface;
 use function array_key_exists;
 
-class CronManager
+class CronManager implements CronManagerInterface
 {
     private const LOG_PREFIX = '[cron manager] ';
 
diff --git a/src/Bundle/ChillMainBundle/Cron/CronManagerInterface.php b/src/Bundle/ChillMainBundle/Cron/CronManagerInterface.php
new file mode 100644
index 000000000..3b9680918
--- /dev/null
+++ b/src/Bundle/ChillMainBundle/Cron/CronManagerInterface.php
@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Chill\MainBundle\Cron;
+
+interface CronManagerInterface
+{
+    public function run(?string $forceJob = null): void;
+}