diff --git a/config/services.yaml b/config/services.yaml
index eaf9094..d510036 100644
--- a/config/services.yaml
+++ b/config/services.yaml
@@ -7,9 +7,9 @@ services:
         public: true
         class: Pcm\IconBundle\Twig\Functions\IconExtension
         arguments:
-            directories:
+            $directories:
                 - '%kernel.project_dir%/public/icons'
-            palletes:
+            $palletes:
                 - primary:
                     stroke: stroke-primary,
                     fill: fill-primary