diff --git a/src/Extensions/MaintenanceLockExtension.php b/src/Extensions/MaintenanceLockExtension.php
index c1f15802..61063f15 100644
--- a/src/Extensions/MaintenanceLockExtension.php
+++ b/src/Extensions/MaintenanceLockExtension.php
@@ -21,7 +21,7 @@ class MaintenanceLockExtension extends DataExtension
     /**
      * @param FieldList $fields
      */
-    public function updateCMSFields(FieldList $fields)
+    protected function updateCMSFields(FieldList $fields)
     {
         if (!QueuedJobService::config()->get('lock_file_enabled')) {
             return;
diff --git a/src/Extensions/ScheduledExecutionExtension.php b/src/Extensions/ScheduledExecutionExtension.php
index 3eb0861e..4aeec810 100644
--- a/src/Extensions/ScheduledExecutionExtension.php
+++ b/src/Extensions/ScheduledExecutionExtension.php
@@ -58,7 +58,7 @@ class ScheduledExecutionExtension extends DataExtension
     /**
      * @param FieldList $fields
      */
-    public function updateCMSFields(FieldList $fields)
+    protected function updateCMSFields(FieldList $fields)
     {
         $fields->removeByName([
             'ExecuteInterval',