diff --git a/dist/Resources/config/factory.xml b/dist/Resources/config/factory.xml
index 87466293..4af1cd05 100644
--- a/dist/Resources/config/factory.xml
+++ b/dist/Resources/config/factory.xml
@@ -13,7 +13,7 @@
 
         <service id="csa_guzzle.client_factory" class="%csa_guzzle.client_factory.class%">
             <argument>%csa_guzzle.client.class%</argument>
-            <argument />
+            <argument type="collection" />
         </service>
 
     </services>