diff --git a/test/unit/ticket_trigger_test.rb b/test/unit/ticket_trigger_test.rb
index 2a22d501d..92086a41a 100644
--- a/test/unit/ticket_trigger_test.rb
+++ b/test/unit/ticket_trigger_test.rb
@@ -4,6 +4,11 @@ require 'test_helper'
 
 class TicketTriggerTest < ActiveSupport::TestCase
 
+  processing_timeout = HtmlSanitizer.const_get(:PROCESSING_TIMEOUT)
+
+  # XSS processing may run into a timeout on slow CI systems, so turn the timeout off for the test.
+  HtmlSanitizer.const_set(:PROCESSING_TIMEOUT, 0.0001)
+
   setup do
     Setting.set('ticket_trigger_recursive', true)
   end
@@ -4683,4 +4688,6 @@ class TicketTriggerTest < ActiveSupport::TestCase
     assert_match('Thanks for your inquiry (Online-apotheke. Günstigster Preis. Ohne Rezepte)!', article1.subject)
     assert_equal(0, article1.attachments.count)
   end
+
+  HtmlSanitizer.const_set(:PROCESSING_TIMEOUT, processing_timeout)
 end