diff --git a/Resources/config/doctrine/Client.orm.xml b/Resources/config/doctrine/Client.orm.xml
index f2b2d5c4..43f5bf2a 100644
--- a/Resources/config/doctrine/Client.orm.xml
+++ b/Resources/config/doctrine/Client.orm.xml
@@ -6,8 +6,8 @@
 
     <mapped-superclass name="FOS\OAuthServerBundle\Entity\Client">
         <field name="randomId" column="random_id" type="string" />
-        <field name="redirectUris" column="redirect_uris" type="array" />
+        <field name="redirectUris" column="redirect_uris" type="json" />
         <field name="secret" column="secret" type="string" />
-        <field name="allowedGrantTypes" column="allowed_grant_types" type="array" />
+        <field name="allowedGrantTypes" column="allowed_grant_types" type="json" />
     </mapped-superclass>
 </doctrine-mapping>