diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index e6c0d731c..272146200 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -1672,7 +1672,6 @@ Style/StringLiterals:
 # SupportedStyles: single_quotes, double_quotes
 Style/StringLiteralsInInterpolation:
   Exclude:
-    - 'app/helpers/issues_helper.rb'
     - 'app/models/issue_query.rb'
     - 'config/environment.rb'
     - 'lib/redmine/scm/adapters/cvs_adapter.rb'
diff --git a/app/helpers/issues_helper.rb b/app/helpers/issues_helper.rb
index 7772ced60..50fdab5b5 100644
--- a/app/helpers/issues_helper.rb
+++ b/app/helpers/issues_helper.rb
@@ -65,7 +65,7 @@ module IssuesHelper
       "<strong>#{@cached_label_status}</strong>: #{h(issue.status.name) + (" (#{format_date(issue.closed_on)})" if issue.closed?)}<br />".html_safe +
       "<strong>#{@cached_label_start_date}</strong>: #{format_date(issue.start_date)}<br />".html_safe +
       "<strong>#{@cached_label_due_date}</strong>: #{format_date(issue.due_date)}<br />".html_safe +
-      "<strong>#{@cached_label_assigned_to}</strong>: #{avatar(issue.assigned_to, :size => "13", :title => l(:field_assigned_to)) if issue.assigned_to} #{h(issue.assigned_to)}<br />".html_safe +
+      "<strong>#{@cached_label_assigned_to}</strong>: #{avatar(issue.assigned_to, :size => '13', :title => l(:field_assigned_to)) if issue.assigned_to} #{h(issue.assigned_to)}<br />".html_safe +
       "<strong>#{@cached_label_priority}</strong>: #{h(issue.priority.name)}".html_safe
   end