diff --git a/core/modules/forum/forum.services.yml b/core/modules/forum/forum.services.yml
index 8855717186..4c99bacc07 100644
--- a/core/modules/forum/forum.services.yml
+++ b/core/modules/forum/forum.services.yml
@@ -16,7 +16,7 @@ services:
       - { name: breadcrumb_builder, priority: 1001 }
   forum.index_storage:
     class: Drupal\forum\ForumIndexStorage
-    arguments: ['@database', '@forum_manager']
+    arguments: ['@database']
     tags:
       - { name: backend_overridable }