diff --git a/src/Strategy/InterruptStrategy.php b/src/Strategy/InterruptStrategy.php
index df00922..ac1cffb 100644
--- a/src/Strategy/InterruptStrategy.php
+++ b/src/Strategy/InterruptStrategy.php
@@ -71,7 +71,7 @@ public function onStopConditionCheck(WorkerEvent $event)
      */
     public function onPCNTLSignal($signo)
     {
-        switch($signo) {
+        switch ($signo) {
             case SIGTERM:
             case SIGINT:
                 $this->interrupted = true;