diff --git a/src/Plugin/ServiceLocatorPlugin.php b/src/Plugin/ServiceLocatorPlugin.php
index bcd4b43..1cba163 100644
--- a/src/Plugin/ServiceLocatorPlugin.php
+++ b/src/Plugin/ServiceLocatorPlugin.php
@@ -46,15 +46,16 @@ function (ActionEvent $actionEvent): void {
                 }
 
                 // for event bus only
-                $eventListeners = [];
-                foreach ($actionEvent->getParam(EventBus::EVENT_PARAM_EVENT_LISTENERS, []) as $eventListenerAlias) {
+                $currentEventListeners = $actionEvent->getParam(EventBus::EVENT_PARAM_EVENT_LISTENERS, []);
+                $newEventListeners = [];
+
+                foreach ($currentEventListeners as $eventListenerAlias) {
                     if (is_string($eventListenerAlias) && $this->serviceLocator->has($eventListenerAlias)) {
-                        $eventListeners[] = $this->serviceLocator->get($eventListenerAlias);
+                        $newEventListeners[] = $this->serviceLocator->get($eventListenerAlias);
                     }
                 }
-                if (! empty($eventListeners)) {
-                    $actionEvent->setParam(EventBus::EVENT_PARAM_EVENT_LISTENERS, $eventListeners);
-                }
+
+                $actionEvent->setParam(EventBus::EVENT_PARAM_EVENT_LISTENERS, array_merge($currentEventListeners, $newEventListeners));
             },
             MessageBus::PRIORITY_LOCATE_HANDLER
         );
diff --git a/tests/Plugin/ServiceLocatorPluginTest.php b/tests/Plugin/ServiceLocatorPluginTest.php
index ac30c75..069b8b8 100644
--- a/tests/Plugin/ServiceLocatorPluginTest.php
+++ b/tests/Plugin/ServiceLocatorPluginTest.php
@@ -15,8 +15,11 @@
 use PHPUnit\Framework\TestCase;
 use Prooph\Common\Event\ActionEvent;
 use Prooph\ServiceBus\CommandBus;
+use Prooph\ServiceBus\EventBus;
+use Prooph\ServiceBus\Plugin\Router\EventRouter;
 use Prooph\ServiceBus\Plugin\ServiceLocatorPlugin;
 use ProophTest\ServiceBus\Mock\MessageHandler;
+use ProophTest\ServiceBus\Mock\SomethingDone;
 use Psr\Container\ContainerInterface;
 
 class ServiceLocatorPluginTest extends TestCase
@@ -49,4 +52,41 @@ function (ActionEvent $actionEvent): void {
 
         $commandBus->dispatch('foo');
     }
+
+    /**
+     * @test
+     * @group by
+     */
+    public function it_doesnt_override_previous_event_handlers(): void
+    {
+        $handledOne = false;
+
+        $handlerOne = function (SomethingDone $event) use (&$handledOne): void {
+            $handledOne = true;
+        };
+
+        $handlerTwo = new MessageHandler();
+
+        $container = $this->prophesize(ContainerInterface::class);
+
+        $container->has('custom-handler')->willReturn(true)->shouldBeCalled();
+
+        $container->get('custom-handler')->willReturn($handlerTwo)->shouldBeCalled();
+
+        $eventBus = new EventBus();
+
+        $router = new EventRouter();
+        $router->route(SomethingDone::class)->to($handlerOne)->andTo('custom-handler');
+
+        $router->attachToMessageBus($eventBus);
+
+        $locatorPlugin = new ServiceLocatorPlugin($container->reveal());
+
+        $locatorPlugin->attachToMessageBus($eventBus);
+
+        $eventBus->dispatch(new SomethingDone(['foo' => 'bar']));
+
+        $this->assertTrue($handledOne);
+        $this->assertSame(1, $handlerTwo->getInvokeCounter());
+    }
 }