diff --git a/activesupport/lib/active_support/core_ext/object/extending.rb b/activesupport/lib/active_support/core_ext/object/extending.rb
index 7ac13d3d1aac4c106af99aa96c6b98d9933126ab..b8b697038213dad5891886985eefa0fbe9380fb0 100644
--- a/activesupport/lib/active_support/core_ext/object/extending.rb
+++ b/activesupport/lib/active_support/core_ext/object/extending.rb
@@ -1,4 +1,5 @@
 require 'active_support/core_ext/class/removal'
+require 'active_support/core_ext/object/blank'
 
 class Class
   # Rubinius