diff --git a/ChangeLog b/ChangeLog
index 4ec8855d33..f4c0237c3e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sun Jun 22 09:04:50 2014  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* lib/uri/mailto.rb (initialize): as previous commit, fix arg_check
+
 Sun Jun 22 09:01:47 2014  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* lib/uri/ftp.rb (initialize): argument checking flag is arg_check,
diff --git a/lib/uri/mailto.rb b/lib/uri/mailto.rb
index 079340cf58..03155fb917 100644
--- a/lib/uri/mailto.rb
+++ b/lib/uri/mailto.rb
@@ -138,7 +138,7 @@ module URI
       @headers = []
 
       if MAILTO_REGEXP =~ @opaque
-        if arg[-1]
+        if arg[10] # arg_check
           self.to = $1
           self.headers = $2
         else