diff --git a/src/Bundle/ChillCalendarBundle/Entity/Calendar.php b/src/Bundle/ChillCalendarBundle/Entity/Calendar.php
index 75761598d..45d47f3c5 100644
--- a/src/Bundle/ChillCalendarBundle/Entity/Calendar.php
+++ b/src/Bundle/ChillCalendarBundle/Entity/Calendar.php
@@ -125,7 +125,7 @@ class Calendar
     /**
      * @ORM\Column(type="boolean", nullable=true)
      */
-    private $sendSMS;
+    private boolean $sendSMS;
 
     public function __construct()
     {