diff --git a/activesupport/lib/active_support/core_ext/date_and_time/calculations.rb b/activesupport/lib/active_support/core_ext/date_and_time/calculations.rb
index 2de0d19a7e6..4da7fdd1593 100644
--- a/activesupport/lib/active_support/core_ext/date_and_time/calculations.rb
+++ b/activesupport/lib/active_support/core_ext/date_and_time/calculations.rb
@@ -1,3 +1,5 @@
+require 'active_support/core_ext/object/try'
+
 module DateAndTime
   module Calculations
     DAYS_INTO_WEEK = {