diff --git a/Resources/config/validation.yml b/Resources/config/validation.yml
index 87f696f43..cd94af646 100644
--- a/Resources/config/validation.yml
+++ b/Resources/config/validation.yml
@@ -1,27 +1,29 @@
 Chill\MainBundle\Entity\PermissionsGroup:
     properties:
-        name: 
+        name:
             - NotBlank: ~
             - Length:
                 max: 50
         roleScopes:
             - Valid: ~
     constraints:
-        - Callback: [isRoleScopePresentOnce]
-        
+        - Callback:
+              callback: isRoleScopePresentOnce
+
 Chill\MainBundle\Entity\User:
     properties:
         username:
-            - Length: 
+            - Length:
                 max: 70
                 min: 3
     constraints:
-        - Callback: [isGroupCenterPresentOnce]
+        - Callback:
+              callback: isGroupCenterPresentOnce
 
 Chill\MainBundle\Entity\RoleScope:
     constraints:
         - \Chill\MainBundle\Validation\Constraint\RoleScopeScopePresenceConstraint: ~
-        
+
 Chill\MainBundle\Entity\Center:
     properties:
         name:
@@ -41,11 +43,11 @@ Chill\MainBundle\Entity\Address:
         validFrom:
             - NotNull: ~
             - Date: ~
-            
+
 Chill\MainBundle\Entity\PostalCode:
     properties:
         name:
-            - Length: 
+            - Length:
                 max: 250
                 min: 2
         code:
@@ -53,4 +55,4 @@ Chill\MainBundle\Entity\PostalCode:
                 min: 2
                 max: 100
         country:
-            - NotNull: ~
\ No newline at end of file
+            - NotNull: ~