diff --git a/lib/fluent/config/v1_parser.rb b/lib/fluent/config/v1_parser.rb
index 7432e6c924..d8806c9377 100644
--- a/lib/fluent/config/v1_parser.rb
+++ b/lib/fluent/config/v1_parser.rb
@@ -172,7 +172,7 @@ def eval_include(attrs, elems, uri)
           require 'open-uri'
           basepath = '/'
           fname = path
-          data = URI.open(uri) { |f| f.read }
+          data = u.open { |f| f.read }
           data.force_encoding('UTF-8')
           ss = StringScanner.new(data)
           V1Parser.new(ss, basepath, fname, @eval_context).parse_element(true, nil, attrs, elems)