diff --git a/Resources/config/validation.yml b/Resources/config/validation.yml
index d6a12b418..d5c7d2243 100644
--- a/Resources/config/validation.yml
+++ b/Resources/config/validation.yml
@@ -7,7 +7,7 @@ Chill\EventBundle\Entity\Participation:
         person:
             - NotNull: ~
     constraints:
-        - Callback: [isConsistent]
+        - Callback: isConsistent
         
        
 Chill\EventBundle\Entity\Event: