diff --git a/.rubocop.yml b/.rubocop.yml
index 73f1d18f0..4b63e0b5f 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -83,6 +83,9 @@ Style/AsciiComments:
 Style/EmptyElse:
   EnforcedStyle: empty
 
+Style/FormatString:
+  EnforcedStyle: sprintf
+
 Style/FormatStringToken:
   Enabled: false
 
diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 0e499a5a5..4b5915796 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -1123,13 +1123,10 @@ Style/For:
 # SupportedStyles: format, sprintf, percent
 Style/FormatString:
   Exclude:
-    - 'app/helpers/application_helper.rb'
-    - 'app/helpers/queries_helper.rb'
     - 'app/models/query.rb'
     - 'config/initializers/10-patches.rb'
     - 'lib/generators/redmine_plugin_model/redmine_plugin_model_generator.rb'
     - 'lib/redmine/export/csv.rb'
-    - 'lib/redmine/export/pdf/issues_pdf_helper.rb'
     - 'lib/redmine/helpers/gantt.rb'
     - 'lib/redmine/i18n.rb'
     - 'lib/redmine/info.rb'