diff --git a/eZ/Publish/Core/REST/Server/index.php b/eZ/Publish/Core/REST/Server/index.php
index <HASH>..<HASH> 100644
--- a/eZ/Publish/Core/REST/Server/index.php
+++ b/eZ/Publish/Core/REST/Server/index.php
@@ -249,6 +249,8 @@ $valueObjectVisitors = array(
     '\\eZ\\Publish\\Core\\REST\\Server\\Values\\PolicyList'                 => new Output\ValueObjectVisitor\PolicyList( $urlHandler ),
     '\\eZ\\Publish\\API\\Repository\\Values\\User\\Limitation'              => new Output\ValueObjectVisitor\Limitation( $urlHandler ),
     '\\eZ\\Publish\\Core\\REST\\Server\\Values\\RoleAssignmentList'         => new Output\ValueObjectVisitor\RoleAssignmentList( $urlHandler ),
+    '\\eZ\\Publish\\API\\Repository\\Values\\User\\UserRoleAssignment'      => new Output\ValueObjectVisitor\UserRoleAssignment( $urlHandler ),
+    '\\eZ\\Publish\\API\\Repository\\Values\\User\\UserGroupRoleAssignment' => new Output\ValueObjectVisitor\UserGroupRoleAssignment( $urlHandler ),
 
     // Location
REST: Add User(Group)RoleAssignment visitors