diff --git a/activesupport/lib/active_support/core_ext/date/calculations.rb b/activesupport/lib/active_support/core_ext/date/calculations.rb
index 2b76b93153..9d2ad2bbcf 100644
--- a/activesupport/lib/active_support/core_ext/date/calculations.rb
+++ b/activesupport/lib/active_support/core_ext/date/calculations.rb
@@ -1,6 +1,7 @@
 require 'date'
 require 'active_support/duration'
 require 'active_support/core_ext/time/zones'
+require 'active_support/core_ext/object/acts_like'
 
 class Date
   class << self