diff --git a/app/models/request_for_comment.rb b/app/models/request_for_comment.rb
index 193717c6..bbdaf461 100644
--- a/app/models/request_for_comment.rb
+++ b/app/models/request_for_comment.rb
@@ -6,7 +6,6 @@ class RequestForComment < ActiveRecord::Base
 
   has_many :comments, through: :submission
   has_many :subscriptions
-  has_many :subscribers, through: :subscriptions, source: :user, source_type: ExternalUser
 
   scope :unsolved, -> { where(solved: [false, nil]) }