diff --git a/DependencyInjection/Compiler/ModifierClassPass.php b/DependencyInjection/Compiler/ModifierClassPass.php
new file mode 100644
index 0000000..a599048
--- /dev/null
+++ b/DependencyInjection/Compiler/ModifierClassPass.php
@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of the ONGR package.
+ *
+ * (c) NFQ Technologies UAB <info@nfq.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace ONGR\ConnectionsBundle\DependencyInjection\Compiler;
+
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+
+/**
+ * Sets modifier class to abstract service.
+ */
+class ModifierClassPass implements CompilerPassInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function process(ContainerBuilder $container)
+    {
+        if ($container->hasParameter('ongr_connections.import.modifier.class')) {
+            $container
+                ->getDefinition('ongr_connections.import.modifier')
+                ->setClass($container->getParameter('ongr_connections.import.modifier.class'));
+        }
+    }
+}
diff --git a/ONGRConnectionsBundle.php b/ONGRConnectionsBundle.php
index dcfa036..b2e0227 100644
--- a/ONGRConnectionsBundle.php
+++ b/ONGRConnectionsBundle.php
@@ -12,6 +12,7 @@
 namespace ONGR\ConnectionsBundle;
 
 use ONGR\ConnectionsBundle\DependencyInjection\Compiler\ExtractionDescriptorPass;
+use ONGR\ConnectionsBundle\DependencyInjection\Compiler\ModifierClassPass;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\HttpKernel\Bundle\Bundle;
 
@@ -28,5 +29,6 @@ public function build(ContainerBuilder $container)
         parent::build($container);
 
         $container->addCompilerPass(new ExtractionDescriptorPass());
+        $container->addCompilerPass(new ModifierClassPass());
     }
 }
diff --git a/Tests/app/config/services.yml b/Tests/app/config/services.yml
index 3cccd79..3029cd5 100644
--- a/Tests/app/config/services.yml
+++ b/Tests/app/config/services.yml
@@ -65,7 +65,7 @@ services:
                - { name: kernel.event_listener, event: ongr.pipeline.import.default.source, method: onSource }
 
     test.import.modifier:
-        class: %ongr_connections.import.modifier.class%
+        parent: ongr_connections.import.modifier
         tags:
             - { name: kernel.event_listener, event: ongr.pipeline.import.default.modify, method: onModify }