diff --git a/DependencyInjection/Compiler/CustomHandlersPass.php b/DependencyInjection/Compiler/CustomHandlersPass.php
index 7e042931..39e7de5c 100644
--- a/DependencyInjection/Compiler/CustomHandlersPass.php
+++ b/DependencyInjection/Compiler/CustomHandlersPass.php
@@ -6,6 +6,7 @@
 
 use JMS\Serializer\GraphNavigatorInterface;
 use JMS\Serializer\Handler\HandlerRegistry;
+use Symfony\Component\DependencyInjection\Argument\ServiceClosureArgument;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Reference;
@@ -26,7 +27,7 @@ public function process(ContainerBuilder $container)
                 foreach ($handlersByFormat as $format => $handlerCallable) {
                     $id = (string) $handlerCallable[0];
 
-                    $handlerServices[$id] = $handlerCallable[0];
+                    $handlerServices[$id] = new ServiceClosureArgument($handlerCallable[0]);
                     $handlerCallable[0] = $id;
 
                     $handlerRegistryDef->addMethodCall('registerHandler', [$direction, $type, $format, $handlerCallable]);
diff --git a/DependencyInjection/Compiler/RegisterEventListenersAndSubscribersPass.php b/DependencyInjection/Compiler/RegisterEventListenersAndSubscribersPass.php
index 75ac1d84..cd6f0cc3 100644
--- a/DependencyInjection/Compiler/RegisterEventListenersAndSubscribersPass.php
+++ b/DependencyInjection/Compiler/RegisterEventListenersAndSubscribersPass.php
@@ -5,6 +5,7 @@
 namespace JMS\SerializerBundle\DependencyInjection\Compiler;
 
 use JMS\Serializer\EventDispatcher\EventDispatcher;
+use Symfony\Component\DependencyInjection\Argument\ServiceClosureArgument;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Reference;
@@ -29,7 +30,7 @@ public function process(ContainerBuilder $container)
             foreach ($listenersPerEvent as $singleListener) {
                 $id = (string) $singleListener[0][0];
 
-                $listenerServices[$id] = $singleListener[0][0];
+                $listenerServices[$id] = new ServiceClosureArgument($singleListener[0][0]);
                 $singleListener[0][0] = $id;
 
                 $dispatcherDef->addMethodCall('addListener', array_merge([$event], $singleListener));
diff --git a/JMSSerializerBundle.php b/JMSSerializerBundle.php
index 9d931ee0..a2ce0321 100644
--- a/JMSSerializerBundle.php
+++ b/JMSSerializerBundle.php
@@ -35,8 +35,8 @@ function (ContainerBuilder $container, $def) {
         $builder->addCompilerPass(new ExpressionFunctionProviderPass());
         $builder->addCompilerPass(new DoctrinePass());
 
-        $builder->addCompilerPass(new RegisterEventListenersAndSubscribersPass(), PassConfig::TYPE_BEFORE_OPTIMIZATION, -256);
-        $builder->addCompilerPass(new CustomHandlersPass(), PassConfig::TYPE_BEFORE_OPTIMIZATION, -256);
+        $builder->addCompilerPass(new RegisterEventListenersAndSubscribersPass(), PassConfig::TYPE_OPTIMIZE);
+        $builder->addCompilerPass(new CustomHandlersPass(), PassConfig::TYPE_OPTIMIZE);
     }
 
     private function getServiceMapPass($tagName, $keyAttributeName, $callable)