diff --git a/ChangeLog b/ChangeLog
index bfda8be1af..bb85fc2934 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Wed Aug  6 00:15:10 2014  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* lib/uri/http.rb (URI::HTTP#request_uri): optimized.
+	  decrease object allocation, and ensure always create at least one new
+	  object for return value.
+
 Wed Aug  6 03:41:21 2014  Aaron Patterson <aaron@tenderlovemaking.com>
 
 	* ext/psych/lib/psych/visitors/to_ruby.rb: backwards compatibility for
diff --git a/lib/uri/http.rb b/lib/uri/http.rb
index 9877b1ee59..dc47613cdf 100644
--- a/lib/uri/http.rb
+++ b/lib/uri/http.rb
@@ -93,12 +93,12 @@ module URI
     # Otherwise, the path is simply URI#path.
     #
     def request_uri
-      r = path_query
-      if r && r[0] != ?/
-        r = '/' + r
+      return nil unless @path
+      if @path.start_with?(?/.freeze)
+        @query ? "#@path?#@query" : @path.dup
+      else
+        @query ? "/#@path?#@query" : "/#@path"
       end
-
-      r
     end
   end