diff --git a/app/models/conference.rb b/app/models/conference.rb
index 552d5248..4b7e4bf2 100644
--- a/app/models/conference.rb
+++ b/app/models/conference.rb
@@ -42,6 +42,7 @@ class Conference < ActiveRecord::Base
   has_many :difficulty_levels, dependent: :destroy
   has_many :rooms, dependent: :destroy
   has_many :registrations, dependent: :destroy
+  has_many :participants, through: :registrations, source: :user
   has_many :vdays, dependent: :destroy
   has_many :vpositions, dependent: :destroy
   has_many :sponsorship_levels, dependent: :destroy