diff --git a/activesupport/test/dependencies_test.rb b/activesupport/test/dependencies_test.rb
index 99c53924c2..9026126044 100644
--- a/activesupport/test/dependencies_test.rb
+++ b/activesupport/test/dependencies_test.rb
@@ -3,6 +3,7 @@ require 'pp'
 require 'active_support/dependencies'
 require 'active_support/core_ext/module/loading'
 require 'active_support/core_ext/kernel/reporting'
+require 'active_support/core_ext/symbol/to_proc'
 
 module ModuleWithMissing
   mattr_accessor :missing_count