diff --git a/lib/Doctrine/ConnectionFactory.php b/lib/Doctrine/ConnectionFactory.php
index de907f0e56..02451a382e 100644
--- a/lib/Doctrine/ConnectionFactory.php
+++ b/lib/Doctrine/ConnectionFactory.php
@@ -3,6 +3,7 @@
 namespace MailPoet\Doctrine;
 
 use MailPoet\Config\Env;
+use MailPoet\Doctrine\Types\BigIntType;
 use MailPoet\Doctrine\Types\JsonOrSerializedType;
 use MailPoet\Doctrine\Types\JsonType;
 use MailPoet\Doctrine\Types\SerializedArrayType;
@@ -18,6 +19,7 @@ class ConnectionFactory {
   private $minWaitTimeout = 60;
 
   private $types = [
+    BigIntType::NAME => BigIntType::class,
     JsonType::NAME => JsonType::class,
     JsonOrSerializedType::NAME => JsonOrSerializedType::class,
     SerializedArrayType::NAME => SerializedArrayType::class,
diff --git a/lib/Doctrine/Types/BigIntType.php b/lib/Doctrine/Types/BigIntType.php
new file mode 100644
index 0000000000..12e55ab0c8
--- /dev/null
+++ b/lib/Doctrine/Types/BigIntType.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace MailPoet\Doctrine\Types;
+
+use MailPoetVendor\Doctrine\DBAL\Platforms\AbstractPlatform;
+use MailPoetVendor\Doctrine\DBAL\Types\BigIntType as DoctrineBigIntType;
+use PDO;
+
+class BigIntType extends DoctrineBigIntType {
+  // override Doctrine's bigint type that historically maps DB's "bigint" to PHP's "string"
+  // (we want to map DB's "bigint" to PHP's "int" in today's 64-bit world)
+  const NAME = 'bigint';
+
+  public function getBindingType() {
+    return PDO::PARAM_INT;
+  }
+
+  public function convertToPHPValue($value, AbstractPlatform $platform) {
+    return $value === null ? null : (int)$value;
+  }
+
+  public function getName() {
+    return self::NAME;
+  }
+}