diff --git a/activesupport/test/core_ext/array_ext_test.rb b/activesupport/test/core_ext/array_ext_test.rb
index 5ff8fcdae1..112cb998b1 100644
--- a/activesupport/test/core_ext/array_ext_test.rb
+++ b/activesupport/test/core_ext/array_ext_test.rb
@@ -1,6 +1,6 @@
 require 'abstract_unit'
-require 'bigdecimal'
 require 'active_support/core_ext/array'
+require 'active_support/core_ext/big_decimal'
 
 class ArrayExtAccessTests < Test::Unit::TestCase
   def test_from