diff --git a/activesupport/lib/active_support/core_ext/array/inquiry.rb b/activesupport/lib/active_support/core_ext/array/inquiry.rb
index de623c466cb..e8f44cc3780 100644
--- a/activesupport/lib/active_support/core_ext/array/inquiry.rb
+++ b/activesupport/lib/active_support/core_ext/array/inquiry.rb
@@ -1,3 +1,5 @@
+require 'active_support/array_inquirer'
+
 class Array
   # Wraps the array in an +ArrayInquirer+ object, which gives a friendlier way
   # to check its string-like contents.