diff --git a/Utils/TaskSchedule/SchedulerAbstract.php b/Utils/TaskSchedule/SchedulerAbstract.php
index 19647a3c2..25cdf5a8e 100644
--- a/Utils/TaskSchedule/SchedulerAbstract.php
+++ b/Utils/TaskSchedule/SchedulerAbstract.php
@@ -34,7 +34,7 @@ abstract class SchedulerAbstract
      * @var string
      * @since 1.0.0
      */
-    protected static $bin = '';
+    private static $bin = '';
 
     /**
      * Get git binary.