diff --git a/activesupport/lib/active_support/benchmarkable.rb b/activesupport/lib/active_support/benchmarkable.rb
index 6a41aab166109..ee02ecb043461 100644
--- a/activesupport/lib/active_support/benchmarkable.rb
+++ b/activesupport/lib/active_support/benchmarkable.rb
@@ -1,4 +1,5 @@
 require 'active_support/core_ext/benchmark'
+require 'active_support/core_ext/hash/keys'
 
 module ActiveSupport
   module Benchmarkable