diff --git a/Resources/config/services.yml b/Resources/config/services.yml
index 01f2d7a..92ebde8 100644
--- a/Resources/config/services.yml
+++ b/Resources/config/services.yml
@@ -8,9 +8,9 @@ parameters:
 services:
     snowcap_ogone:
         class: Snowcap\OgoneBundle\OgoneManager
-        arguments: [@event_dispatcher, @logger, @snowcap_ogone.form_generator, %pspid%, %environment%, %sha_in%, %sha_out%, %options%]
+        arguments: ['@event_dispatcher', '@logger', '@snowcap_ogone.form_generator', %pspid%, %environment%, %sha_in%, %sha_out%, %options%]
 
     snowcap_ogone.form_generator:
         class: Snowcap\OgoneBundle\FormGenerator\SimpleFormGenerator
-        arguments: [@twig, %kernel.root_dir%]
-        private: true
\ No newline at end of file
+        arguments: ['@twig', %kernel.root_dir%]
+        private: true