diff --git a/activesupport/lib/active_support/cache.rb b/activesupport/lib/active_support/cache.rb
index f2d957f15434d815bd2f1174bc723f508043c06d..ad238c1d9628496772c7898ed23585e0876a0e98 100644
--- a/activesupport/lib/active_support/cache.rb
+++ b/activesupport/lib/active_support/cache.rb
@@ -4,6 +4,7 @@
 require 'active_support/core_ext/exception'
 require 'active_support/core_ext/class/attribute_accessors'
 require 'active_support/core_ext/object/to_param'
+require 'active_support/core_ext/string/inflections'
 
 module ActiveSupport
   # See ActiveSupport::Cache::Store for documentation.