diff --git a/lib/grape/http/request.rb b/lib/grape/http/request.rb
index 011e1fd358..ebcd3e2b66 100644
--- a/lib/grape/http/request.rb
+++ b/lib/grape/http/request.rb
@@ -1,8 +1,23 @@
 module Grape
   class Request < Rack::Request
+    class Params < ::Hash
+      include Hashie::Extensions::MergeInitializer
+      include Hashie::Extensions::IndifferentAccess
+      include Hashie::Extensions::MethodAccess
+
+      def convert_value(value)
+        super(value).tap do |converted_value|
+          if converted_value.is_a?(Hash)
+            value_self = (class << converted_value; self; end)
+            value_self.send :include, Hashie::Extensions::MethodAccess
+          end
+        end
+      end
+    end
+
     def params
       @params ||= begin
-        params = Hashie::Mash.new(super)
+        params = Params.new(super)
         if env['rack.routing_args']
           args = env['rack.routing_args'].dup
           # preserve version from query string parameters
diff --git a/lib/grape/validations/coerce.rb b/lib/grape/validations/coerce.rb
index 910166403a..67b4e7a5d0 100644
--- a/lib/grape/validations/coerce.rb
+++ b/lib/grape/validations/coerce.rb
@@ -31,7 +31,7 @@ def _valid_single_type?(klass, val)
         if klass == Virtus::Attribute::Boolean
           val.is_a?(TrueClass) || val.is_a?(FalseClass)
         elsif klass == Rack::Multipart::UploadedFile
-          val.is_a?(Hashie::Mash) && val.key?(:tempfile)
+          val.is_a?(Hash) && val.key?(:tempfile)
         else
           val.is_a?(klass)
         end