diff --git a/test/Performance/TaskmasterBenchCase.php b/test/Performance/TaskmasterBenchCase.php
index fe529ee..a9781c2 100644
--- a/test/Performance/TaskmasterBenchCase.php
+++ b/test/Performance/TaskmasterBenchCase.php
@@ -20,6 +20,7 @@ protected function runBench(WorkerInterface $worker, int $count = 1): void
         $taskmaster->addWorkers($worker, $count);
         $this->setupTasks($taskmaster);
         $taskmaster->wait();
+        $taskmaster->stop();
     }
 
     public function benchSync(): void