diff --git a/spec/rubocop/cop/rspec/factory_bot/attribute_defined_statically_spec.rb b/spec/rubocop/cop/rspec/factory_bot/attribute_defined_statically_spec.rb
index e14ef30bc..20936390f 100644
--- a/spec/rubocop/cop/rspec/factory_bot/attribute_defined_statically_spec.rb
+++ b/spec/rubocop/cop/rspec/factory_bot/attribute_defined_statically_spec.rb
@@ -1,10 +1,6 @@
 # frozen_string_literal: true
 
 RSpec.describe RuboCop::Cop::RSpec::FactoryBot::AttributeDefinedStatically do
-  def inspected_source_filename
-    'spec/factories.rb'
-  end
-
   it 'registers an offense for offending code' do
     expect_offense(<<-RUBY)
       FactoryBot.define do
diff --git a/spec/rubocop/cop/rspec/factory_bot/factory_class_name_spec.rb b/spec/rubocop/cop/rspec/factory_bot/factory_class_name_spec.rb
index b2d1705e6..31fb5d217 100644
--- a/spec/rubocop/cop/rspec/factory_bot/factory_class_name_spec.rb
+++ b/spec/rubocop/cop/rspec/factory_bot/factory_class_name_spec.rb
@@ -1,10 +1,6 @@
 # frozen_string_literal: true
 
 RSpec.describe RuboCop::Cop::RSpec::FactoryBot::FactoryClassName do
-  def inspected_source_filename
-    'spec/factories.rb'
-  end
-
   context 'when passing block' do
     it 'flags passing a class' do
       expect_offense(<<~RUBY)
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index fc00e62a5..8a0551605 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -33,7 +33,7 @@ module SpecHelper
   # We should take their advice!
   config.raise_on_warning = true
 
-  config.include(ExpectOffense)
+  config.include(RuboCop::RSpec::ExpectOffense)
 
   config.include_context 'with default RSpec/Language config', :config
   config.include_context 'smoke test', type: :cop_spec
diff --git a/spec/support/expect_offense.rb b/spec/support/expect_offense.rb
deleted file mode 100644
index 957c728ec..000000000
--- a/spec/support/expect_offense.rb
+++ /dev/null
@@ -1,27 +0,0 @@
-# frozen_string_literal: true
-
-# rubocop-rspec gem extension of RuboCop's ExpectOffense module.
-#
-# This mixin is the same as rubocop's ExpectOffense except the default
-# filename ends with `_spec.rb`
-#
-# Cops assigned to departments may focus on different files, so it is
-# possible to override the inspected file name.
-module ExpectOffense
-  include RuboCop::RSpec::ExpectOffense
-
-  DEFAULT_FILENAME = 'example_spec.rb'
-
-  def expect_offense(source, filename = inspected_source_filename,
-                     *args, **kwargs)
-    super
-  end
-
-  def expect_no_offenses(source, filename = inspected_source_filename)
-    super
-  end
-
-  def inspected_source_filename
-    DEFAULT_FILENAME
-  end
-end