diff --git a/src/Resources/config/doctrine/ShippingGateway.orm.xml b/src/Resources/config/doctrine/ShippingGateway.orm.xml
index 7bb45ad..83bad74 100644
--- a/src/Resources/config/doctrine/ShippingGateway.orm.xml
+++ b/src/Resources/config/doctrine/ShippingGateway.orm.xml
@@ -12,7 +12,7 @@
 
         <field name="code" column="code" type="string" nullable="false"/>
 
-        <field name="config" column="config" type="array" nullable="false"/>
+        <field name="config" column="config" type="json" nullable="false"/>
 
         <field name="name" column="name" type="string" nullable="false"/>
 
@@ -29,4 +29,4 @@
 
         <one-to-many field="shippingExports" target-entity="BitBag\SyliusShippingExportPlugin\Entity\ShippingExportInterface" mapped-by="shippingGateway" orphan-removal="true"/>
     </mapped-superclass>
-</doctrine-mapping>
\ No newline at end of file
+</doctrine-mapping>