diff --git a/lib/rubocop/cop/performance_cops.rb b/lib/rubocop/cop/performance_cops.rb
index e966c56834..0d0a13d621 100644
--- a/lib/rubocop/cop/performance_cops.rb
+++ b/lib/rubocop/cop/performance_cops.rb
@@ -1,13 +1,5 @@
 # frozen_string_literal: true
 
-module RuboCop
-  # RuboCop included the performance cops directly before version 1.0.0.
-  # We can remove them to avoid warnings about redefining constants.
-  module Cop
-    remove_const('Performance') if const_defined?('Performance')
-  end
-end
-
 require_relative 'performance/caller'
 require_relative 'performance/case_when_splat'
 require_relative 'performance/casecmp'