diff --git a/activesupport/lib/active_support/test_case.rb b/activesupport/lib/active_support/test_case.rb
index 4bb4cd196e537..bfe73de5167ed 100644
--- a/activesupport/lib/active_support/test_case.rb
+++ b/activesupport/lib/active_support/test_case.rb
@@ -36,6 +36,7 @@ def self.test_order # :nodoc:
     alias :assert_not_nil :refute_nil
     alias :assert_not_equal :refute_equal
     alias :assert_no_match :refute_match
+    alias :assert_not_same :refute_same
 
     def assert_nothing_raised(*args)
       yield