diff --git a/actionpack/lib/action_dispatch/http/request.rb b/actionpack/lib/action_dispatch/http/request.rb
index 071ff0b63e..1318c62fbe 100644
--- a/actionpack/lib/action_dispatch/http/request.rb
+++ b/actionpack/lib/action_dispatch/http/request.rb
@@ -271,7 +271,7 @@ module ActionDispatch
 
     # Override Rack's GET method to support indifferent access
     def GET
-      @env["action_dispatch.request.query_parameters"] ||= deep_munge((normalize_encode_params(super) || {}))
+      @env["action_dispatch.request.query_parameters"] ||= Utils.deep_munge((normalize_encode_params(super) || {}))
     rescue TypeError => e
       raise ActionController::BadRequest.new(:query, e)
     end
@@ -279,7 +279,7 @@ module ActionDispatch
 
     # Override Rack's POST method to support indifferent access
     def POST
-      @env["action_dispatch.request.request_parameters"] ||= deep_munge((normalize_encode_params(super) || {}))
+      @env["action_dispatch.request.request_parameters"] ||= Utils.deep_munge((normalize_encode_params(super) || {}))
     rescue TypeError => e
       raise ActionController::BadRequest.new(:request, e)
     end