diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 1300aa3..cb3756a 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -88,16 +88,6 @@ Style/FileName:
     - 'config/initializers/cve-2013-0156.rb'
     - 'script/rspec-queue-mongoid.rb'
 
-# Offense count: 8
-# Configuration parameters: EnforcedStyle, SupportedStyles.
-Style/FormatString:
-  Exclude:
-    - 'app/decorators/backtrace_line_decorator.rb'
-    - 'app/helpers/problems_helper.rb'
-    - 'spec/views/apps/edit.html.haml_spec.rb'
-    - 'spec/views/problems/show.html.haml_spec.rb'
-    - 'spec/views/users/show.html.haml_spec.rb'
-
 # Offense count: 27
 # Configuration parameters: MinBodyLength.
 Style/GuardClause:
diff --git a/app/decorators/backtrace_line_decorator.rb b/app/decorators/backtrace_line_decorator.rb
index 3fad36a..c7d87b3 100644
--- a/app/decorators/backtrace_line_decorator.rb
+++ b/app/decorators/backtrace_line_decorator.rb
@@ -73,13 +73,13 @@ private
 
   def link_to_github(app, text = nil)
     return unless app.github_repo?
-    href = "%s#L%s" % [app.github_url_to_file(decorated_path + file_name), number]
+    href = format("%s#L%s", app.github_url_to_file(decorated_path + file_name), number)
     h.link_to(text || file_name, href, target: '_blank')
   end
 
   def link_to_bitbucket(app, text = nil)
     return unless app.bitbucket_repo?
-    href = "%s#%s-%s" % [app.bitbucket_url_to_file(decorated_path + file_name), file_name, number]
+    href = format("%s#%s-%s", app.bitbucket_url_to_file(decorated_path + file_name), file_name, number)
     h.link_to(text || file_name, href, target: '_blank')
   end
 
diff --git a/app/helpers/problems_helper.rb b/app/helpers/problems_helper.rb
index f14fb03..8bc14b3 100644
--- a/app/helpers/problems_helper.rb
+++ b/app/helpers/problems_helper.rb
@@ -1,6 +1,6 @@
 module ProblemsHelper
   def problem_confirm(action)
-    t('problems.confirm.%s' % action) unless Errbit::Config.confirm_err_actions.eql? false
+    t(format('problems.confirm.%s', action)) unless Errbit::Config.confirm_err_actions.eql? false
   end
 
   def truncated_problem_message(problem)
diff --git a/spec/views/apps/edit.html.haml_spec.rb b/spec/views/apps/edit.html.haml_spec.rb
index 9c03211..9914368 100644
--- a/spec/views/apps/edit.html.haml_spec.rb
+++ b/spec/views/apps/edit.html.haml_spec.rb
@@ -15,12 +15,22 @@ describe "apps/edit.html.haml", type: 'view' do
 
     it "should confirm the 'reset' link" do
       render
-      expect(action_bar).to have_selector('a.button[data-confirm="%s"]' % I18n.t('apps.confirm_destroy_all_problems'))
+      expect(action_bar).to have_selector(
+        format(
+          'a.button[data-confirm="%s"]',
+          I18n.t('apps.confirm_destroy_all_problems')
+        )
+      )
     end
 
     it "should confirm the 'destroy' link" do
       render
-      expect(action_bar).to have_selector('a.button[data-confirm="%s"]' % I18n.t('apps.confirm_delete'))
+      expect(action_bar).to have_selector(
+        format(
+          'a.button[data-confirm="%s"]',
+          I18n.t('apps.confirm_delete')
+        )
+      )
     end
   end
 
diff --git a/spec/views/problems/show.html.haml_spec.rb b/spec/views/problems/show.html.haml_spec.rb
index ef1fc12..bae7cf8 100644
--- a/spec/views/problems/show.html.haml_spec.rb
+++ b/spec/views/problems/show.html.haml_spec.rb
@@ -66,13 +66,23 @@ describe "problems/show.html.haml", type: 'view' do
 
     it "should confirm the 'resolve' link by default" do
       render
-      expect(action_bar).to have_selector('a.resolve[data-confirm="%s"]' % I18n.t('problems.confirm.resolve_one'))
+      expect(action_bar).to have_selector(
+        format(
+          'a.resolve[data-confirm="%s"]',
+          I18n.t('problems.confirm.resolve_one')
+        )
+      )
     end
 
     it "should confirm the 'resolve' link if configuration is unset" do
       allow(Errbit::Config).to receive(:confirm_err_actions).and_return(nil)
       render
-      expect(action_bar).to have_selector('a.resolve[data-confirm="%s"]' % I18n.t('problems.confirm.resolve_one'))
+      expect(action_bar).to have_selector(
+        format(
+          'a.resolve[data-confirm="%s"]',
+          I18n.t('problems.confirm.resolve_one')
+        )
+      )
     end
 
     it "should not confirm the 'resolve' link if configured not to" do
diff --git a/spec/views/users/show.html.haml_spec.rb b/spec/views/users/show.html.haml_spec.rb
index 7812ee3..82fbf3f 100644
--- a/spec/views/users/show.html.haml_spec.rb
+++ b/spec/views/users/show.html.haml_spec.rb
@@ -53,7 +53,12 @@ describe 'users/show.html.haml', type: 'view' do
 
       it "should confirm the 'resolve' link by default" do
         render
-        expect(view.content_for(:action_bar)).to have_selector('a.delete[data-confirm="%s"]' % I18n.t('.users.confirm_delete'))
+        expect(view.content_for(:action_bar)).to have_selector(
+          format(
+            'a.delete[data-confirm="%s"]',
+            I18n.t('.users.confirm_delete')
+          )
+        )
       end
     end
   end
--
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