diff --git a/activesupport/lib/active_support/core/time.rb b/activesupport/lib/active_support/core/time.rb
index 71565ac6c2..43e13b5e58 100644
--- a/activesupport/lib/active_support/core/time.rb
+++ b/activesupport/lib/active_support/core/time.rb
@@ -1,4 +1,4 @@
 require 'active_support/core/time/autoload'
 require 'active_support/core_ext/time'
 require 'active_support/core_ext/date'
-require 'active_support/core_ext/datetime'
+require 'active_support/core_ext/date_time'