diff --git a/lib/Doctrine/ConnectionFactory.php b/lib/Doctrine/ConnectionFactory.php
index 53f52de0af..fe86e23f33 100644
--- a/lib/Doctrine/ConnectionFactory.php
+++ b/lib/Doctrine/ConnectionFactory.php
@@ -16,6 +16,7 @@ class ConnectionFactory {
   function createConnection() {
     $platform_class = self::PLATFORM_CLASS;
     $connection_params = [
+      'wrapperClass' => SerializableConnection::class,
       'driver' => self::DRIVER,
       'platform' => new $platform_class,
       'host' => Env::$db_host,
diff --git a/lib/Doctrine/SerializableConnection.php b/lib/Doctrine/SerializableConnection.php
new file mode 100644
index 0000000000..b0a49d0e27
--- /dev/null
+++ b/lib/Doctrine/SerializableConnection.php
@@ -0,0 +1,31 @@
+<?php
+
+namespace MailPoet\Doctrine;
+
+use MailPoetVendor\Doctrine\Common\EventManager;
+use MailPoetVendor\Doctrine\DBAL\Configuration;
+use MailPoetVendor\Doctrine\DBAL\Connection;
+use MailPoetVendor\Doctrine\DBAL\Driver;
+
+class SerializableConnection extends Connection {
+  private $params;
+  private $driver;
+  private $config;
+  private $event_manager;
+
+  function __construct(array $params, Driver $driver, Configuration $config = null, EventManager $event_manager = null) {
+    $this->params = $params;
+    $this->driver = $driver;
+    $this->config = $config;
+    $this->event_manager = $event_manager;
+    parent::__construct($params, $driver, $config, $event_manager);
+  }
+
+  function __sleep() {
+    return ['params', 'driver', 'config', 'event_manager'];
+  }
+
+  function __wakeup() {
+    parent::__construct($this->params, $this->driver, $this->config, $this->event_manager);
+  }
+}
diff --git a/tests/integration/Doctrine/ConnectionFactoryTest.php b/tests/integration/Doctrine/ConnectionFactoryTest.php
index 6c9d623bee..abef1f7804 100644
--- a/tests/integration/Doctrine/ConnectionFactoryTest.php
+++ b/tests/integration/Doctrine/ConnectionFactoryTest.php
@@ -4,6 +4,7 @@ namespace MailPoet\Test\Config;
 
 use MailPoet\Config\Env;
 use MailPoet\Doctrine\ConnectionFactory;
+use MailPoet\Doctrine\SerializableConnection;
 use MailPoetVendor\Doctrine\DBAL\Driver\PDOMySql;
 use MailPoetVendor\Doctrine\DBAL\Platforms\MySqlPlatform;
 use PDO;
@@ -13,6 +14,7 @@ class ConnectionFactoryTest extends \MailPoetTest {
     $connection_factory = new ConnectionFactory();
     $connection = $connection_factory->createConnection();
 
+    expect($connection)->isInstanceOf(SerializableConnection::class);
     expect($connection->getWrappedConnection())->isInstanceOf(PDO::class);
     expect($connection->getDriver())->isInstanceOf(PDOMySql\Driver::class);
     expect($connection->getDatabasePlatform())->isInstanceOf(MySqlPlatform::class);