diff --git a/test/unit/html_sanitizer_test.rb b/test/unit/html_sanitizer_test.rb
index 1542cedbc..1fc6364c9 100644
--- a/test/unit/html_sanitizer_test.rb
+++ b/test/unit/html_sanitizer_test.rb
@@ -4,10 +4,16 @@ require 'test_helper'
 
 class HtmlSanitizerTest < ActiveSupport::TestCase
 
-  processing_timeout = HtmlSanitizer.const_get(:PROCESSING_TIMEOUT)
+  setup do
+    @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, nil)
+    # XSS processing may run into a timeout on slow CI systems, so turn the timeout off for the test.
+    HtmlSanitizer.const_set(:PROCESSING_TIMEOUT, nil)
+  end
+
+  teardown do
+    HtmlSanitizer.const_set(:PROCESSING_TIMEOUT, @processing_timeout)
+  end
 
   test 'xss' do
     assert_equal(HtmlSanitizer.strict('<b>123</b>'), '<b>123</b>')
@@ -158,6 +164,4 @@ test 123
 
     assert_equal(HtmlSanitizer.strict('<a href="mailto:testäöü@example.com" id="123">test</a>'), '<a href="mailto:test%C3%A4%C3%B6%C3%BC@example.com">test</a>')
   end
-
-  HtmlSanitizer.const_set(:PROCESSING_TIMEOUT, processing_timeout)
 end
diff --git a/test/unit/ticket_trigger_test.rb b/test/unit/ticket_trigger_test.rb
index 92086a41a..bdcd4efd9 100644
--- a/test/unit/ticket_trigger_test.rb
+++ b/test/unit/ticket_trigger_test.rb
@@ -4,13 +4,17 @@ 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)
+
+    @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, nil)
+  end
+
+  teardown do
+    HtmlSanitizer.const_set(:PROCESSING_TIMEOUT, @processing_timeout)
   end
 
   test '1 basic' do
@@ -4688,6 +4692,4 @@ 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