diff --git a/EventManagerTrait.php b/EventManagerTrait.php
index 61b7ab4..78d7f6f 100644
--- a/EventManagerTrait.php
+++ b/EventManagerTrait.php
@@ -50,7 +50,7 @@ public function mergeEventListeners($eventListeners)
             $listeners->setExtractFlags(ListenerQueue::EXTR_BOTH);
 
             foreach ($listeners as $listener) {
-                if (!in_array($listener['data'], $queue)) {
+                if (!in_array($listener['data'], $queue, true)) {
                     $this->attach($eventName, $listener['data'], $listener['priority']);
                 }
             }