diff --git a/Resources/config/collectors.yml b/Resources/config/collectors.yml
index 63c946e..d504b31 100644
--- a/Resources/config/collectors.yml
+++ b/Resources/config/collectors.yml
@@ -24,7 +24,7 @@ services:
     liuggio_stats_d_client.collector.user:
         class: %liuggio_stats_d_client.collector.user.class%
         calls:
-            - ['setSecurityContext', [@security.context]]
+            - ['setSecurityContext', ['@security.context']]
             - ['setOnlyOnMasterResponse', [true]]
         tags:
             - { name: stats_d_collector}
diff --git a/Resources/config/services.yml b/Resources/config/services.yml
index ea5f2c4..e569cb5 100644
--- a/Resources/config/services.yml
+++ b/Resources/config/services.yml
@@ -23,17 +23,17 @@ services:
 
     liuggio_stats_d_client.service:
         class: %liuggio_stats_d_client.service.class%
-        arguments: [@liuggio_stats_d_client.sender.service, %liuggio_stats_d_client.connection.reduce_packet%, %liuggio_stats_d_client.connection.fail_silently%]
+        arguments: ['@liuggio_stats_d_client.sender.service', %liuggio_stats_d_client.connection.reduce_packet%, %liuggio_stats_d_client.connection.fail_silently%]
 
 # collector service
     liuggio_stats_d_client.collector.service:
         class: %liuggio_stats_d_client.collector.service.class%
-        arguments: [@liuggio_stats_d_client.service]
+        arguments: ['@liuggio_stats_d_client.service']
 
 # simplified service
     liuggio_stats_d.service:
         class: %liuggio_stats_d.sender.class%
-        arguments: [@liuggio_stats_d_client.service, @liuggio_stats_d_client.factory]
+        arguments: ['@liuggio_stats_d_client.service', '@liuggio_stats_d_client.factory']
 
     statsd:
          alias: liuggio_stats_d.service