diff --git a/ChangeLog b/ChangeLog
index 0f1e65f7e8..a920ef1c4d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sun Apr 17 04:18:56 2016  CHIKANAGA Tomoyuki  <nagachika@ruby-lang.org>
+
+	* tool/redmine-backporter.rb: revisions are strings.
+
 Sat Apr 16 14:26:49 2016  Yuichiro Kaneko  <yui-knk@ruby-lang.org>
 
 	* ext/date/date_core.c : remove not used f_getlocal macro.
diff --git a/tool/redmine-backporter.rb b/tool/redmine-backporter.rb
index 7323d37fa1..0806e63f24 100755
--- a/tool/redmine-backporter.rb
+++ b/tool/redmine-backporter.rb
@@ -411,7 +411,7 @@ eom
       puts "ticket not selected"
       next
     end
-    rev = $1.to_i
+    rev = $1
     uri = URI("#{REDMINE_BASE}/projects/ruby-trunk/repository/revisions/#{rev}/issues.json")
     Net::HTTP.start(uri.host, uri.port, http_options) do |http|
       res = http.post(uri.path, "issue_id=#@issue",