diff --git a/src/Tests/ContextTest.php b/src/Tests/ContextTest.php
index 491cf59..64a5ca2 100644
--- a/src/Tests/ContextTest.php
+++ b/src/Tests/ContextTest.php
@@ -73,7 +73,7 @@ class ContextTest extends TestCase
             ->method('futureTick')
             ->with(self::emptyCallable());
 
-        $context->submit(static fn() => null);
+        $context->submit(self::emptyCallable());
     }
 
     public function testItRegistersMaintenanceTasksOnTheEventLoop(): void