diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 05932e915..404822c38 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -1359,7 +1359,6 @@ Style/RedundantRegexpEscape:
     - 'lib/redmine/scm/adapters/bazaar_adapter.rb'
     - 'lib/redmine/wiki_formatting/links_helper.rb'
     - 'lib/redmine/wiki_formatting/macros.rb'
-    - 'lib/redmine/wiki_formatting/section_helper.rb'
     - 'lib/redmine/wiki_formatting/textile/redcloth3.rb'
     - 'test/helpers/application_helper_test.rb'
 
diff --git a/lib/redmine/wiki_formatting/section_helper.rb b/lib/redmine/wiki_formatting/section_helper.rb
index 6f53a3f8e..bc8b1a9bc 100644
--- a/lib/redmine/wiki_formatting/section_helper.rb
+++ b/lib/redmine/wiki_formatting/section_helper.rb
@@ -42,7 +42,7 @@ module Redmine
         i = 0
         l = 1
         inside_pre = false
-        @text.split(/(^(?:\S+\r?\n\r?(?:\=+|\-+)|#+.+|(?:~~~|```).*)\s*$)/).each do |part|
+        @text.split(/(^(?:\S+\r?\n\r?(?:=+|-+)|#+.+|(?:~~~|```).*)\s*$)/).each do |part|
           level = nil
           if part =~ /\A(~{3,}|`{3,})(\s*\S+)?\s*$/
             if !inside_pre
@@ -54,7 +54,7 @@ module Redmine
             # nop
           elsif part =~ /\A(#+).+/
             level = $1.size
-          elsif part =~ /\A.+\r?\n\r?(\=+|\-+)\s*$/
+          elsif part =~ /\A.+\r?\n\r?(=+|-+)\s*$/
             level = $1.include?('=') ? 1 : 2
           end
           if level