diff --git a/actionpack/lib/action_dispatch/middleware/params_parser.rb b/actionpack/lib/action_dispatch/middleware/params_parser.rb
index 1524b00d5bafeb5c7179022ce8b4173e9fbec1ff..09fb1f998a85d4b3bcbc01d49373d9a68b114f7d 100644
--- a/actionpack/lib/action_dispatch/middleware/params_parser.rb
+++ b/actionpack/lib/action_dispatch/middleware/params_parser.rb
@@ -1,3 +1,4 @@
+require 'active_support/core_ext/hash/conversions.rb'
 require 'action_dispatch/http/request'
 
 module ActionDispatch