diff --git a/src/SpriteGenerator/Resources/config/services.yml b/src/SpriteGenerator/Resources/config/services.yml
index 03c2416..43d5604 100644
--- a/src/SpriteGenerator/Resources/config/services.yml
+++ b/src/SpriteGenerator/Resources/config/services.yml
@@ -3,4 +3,4 @@ parameters:
 
 services:
     nfq.sprite:
-        class: %sprite.class%
+        class: "%sprite.class%"