diff --git a/app/controllers/course/members.php b/app/controllers/course/members.php
index 1c492d691b7458db2935c66c50f6d0786063a610..c405d4274df3f7aacda0a393f831a833be363b0f 100644
--- a/app/controllers/course/members.php
+++ b/app/controllers/course/members.php
@@ -1362,7 +1362,7 @@ class Course_MembersController extends AuthenticatedController
                             '%{number} Personen konnten nicht auf die Warteliste verschoben werden:',
                             count($errors)
                         ),
-                        count($errors)
+                        ['number' => count($errors)]
                     ),
                     $errors
                 );