diff --git a/ChangeLog b/ChangeLog
index 09264d00a4..cb517a784f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Mon May  5 23:53:24 2014  Tanaka Akira  <akr@fsij.org>
+
+	* ext/socket/mkconstants.rb: Add IP_TRANSPARENT.
+	  IP_TRANSPARENT is provieded since glibc-2.12.
+	  Reported by Eliezer Croitoru.  [ruby-core:50372] [Bug #7476]
+
 Mon May  5 22:29:47 2014  Tanaka Akira  <akr@fsij.org>
 
 	* process.c (check_exec_redirect): Open the file in write mode for
diff --git a/ext/socket/mkconstants.rb b/ext/socket/mkconstants.rb
index d12b2a24e3..2d38e5ab97 100644
--- a/ext/socket/mkconstants.rb
+++ b/ext/socket/mkconstants.rb
@@ -540,6 +540,7 @@ IP_FREEBIND	nil	Allow binding to nonexistent IP addresses
 IP_IPSEC_POLICY	nil	IPsec security policy
 IP_XFRM_POLICY
 IP_PASSSEC	nil	Retrieve security context with datagram
+IP_TRANSPARENT  nil     Transparent proxy
 IP_PMTUDISC_DONT	nil	Never send DF frames
 IP_PMTUDISC_WANT	nil	Use per-route hints
 IP_PMTUDISC_DO	nil	Always send DF frames