diff --git a/.php-cs-fixer.php b/.php-cs-fixer.php
index 60761206..344ddfe1 100644
--- a/.php-cs-fixer.php
+++ b/.php-cs-fixer.php
@@ -9,6 +9,7 @@
 $config
     ->setRules([
         '@PSR2' => true,
+        'nullable_type_declaration_for_default_null_value' => true,
     ])
     ->setFinder($finder)
 ;
diff --git a/src/Sentry/Laravel/Features/ConsoleSchedulingIntegration.php b/src/Sentry/Laravel/Features/ConsoleSchedulingIntegration.php
index 3de5e4d4..e359c941 100644
--- a/src/Sentry/Laravel/Features/ConsoleSchedulingIntegration.php
+++ b/src/Sentry/Laravel/Features/ConsoleSchedulingIntegration.php
@@ -212,7 +212,7 @@ private function sendCheckIn(CheckIn $checkIn): void
         SentrySdk::getCurrentHub()->captureEvent($event);
     }
 
-    private function createCheckIn(string $slug, CheckInStatus $status, string $id = null): CheckIn
+    private function createCheckIn(string $slug, CheckInStatus $status, ?string $id = null): CheckIn
     {
         $options = SentrySdk::getCurrentHub()->getClient()->getOptions();