diff --git a/app/controllers/assignments_controller.rb b/app/controllers/assignments_controller.rb
index dd81af90984e8104342625c0f508332bb14b183c..553638913002561f835a97dee79ff712106b2faf 100644
--- a/app/controllers/assignments_controller.rb
+++ b/app/controllers/assignments_controller.rb
@@ -57,7 +57,7 @@ class AssignmentsController < ApplicationController
         @user.assignments.each do |assignment|
           session = assignment.session
           other_users = session.assignments.map { |a| a.user.name }
-          other_users = other_users - @user.name
+          other_users = other_users - [ @user.name ]
 
           event = Icalendar::Event.new
           event.dtstart = Icalendar::Values::DateTime.new(session.starts_at, tzid: session.starts_at.zone)