diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index d1f7ca955..c8ea9ab15 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -171,13 +171,6 @@ Layout/IndentFirstArrayElement:
 Layout/IndentFirstHashElement:
   Enabled: false
 
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: squiggly, active_support, powerpack, unindent
-Layout/IndentHeredoc:
-  Exclude:
-    - 'test/unit/lib/redmine/wiki_formatting_test.rb'
-
 # Cop supports --auto-correct.
 # Configuration parameters: EnforcedStyle.
 # SupportedStyles: normal, indented_internal_methods
diff --git a/test/unit/lib/redmine/wiki_formatting_test.rb b/test/unit/lib/redmine/wiki_formatting_test.rb
index 1c5d4d20f..a208cf69a 100644
--- a/test/unit/lib/redmine/wiki_formatting_test.rb
+++ b/test/unit/lib/redmine/wiki_formatting_test.rb
@@ -77,14 +77,12 @@ class Redmine::WikiFormattingTest < ActiveSupport::TestCase
   end
 
   def test_hires_images_should_not_be_recognized_as_email_addresses
-    raw = <<-DIFF
-Image: logo@2x.png
+    raw = <<~DIFF
+      Image: logo@2x.png
     DIFF
-
-    expected = <<-EXPECTED
-<p>Image: logo@2x.png</p>
+    expected = <<~EXPECTED
+      <p>Image: logo@2x.png</p>
     EXPECTED
-
     assert_equal expected.gsub(%r{[\r\n\t]}, ''), Redmine::WikiFormatting::NullFormatter::Formatter.new(raw).to_html.gsub(%r{[\r\n\t]}, '')
   end