diff --git a/ChangeLog b/ChangeLog
index e134899892..d620db6232 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Feb 23 03:19:37 2009  Tanaka Akira  <akr@fsij.org>
+
+	* ext/socket/mkconstants.rb: define SO_TIMESTAMPNS and SCM_TIMESTAMPNS
+	  if available.
+
 Mon Feb 23 02:54:31 2009  Tanaka Akira  <akr@fsij.org>
 
 	* ext/socket/ancdata.c (ancillary_inspect): use SCM_TIMESTAMP instead
diff --git a/ext/socket/mkconstants.rb b/ext/socket/mkconstants.rb
index 101d5a956e..e2efc49295 100644
--- a/ext/socket/mkconstants.rb
+++ b/ext/socket/mkconstants.rb
@@ -559,6 +559,7 @@ SO_ATTACH_FILTER
 SO_DETACH_FILTER
 SO_PEERNAME
 SO_TIMESTAMP
+SO_TIMESTAMPNS
 SO_BINTIME
 SO_RECVUCRED
 SO_MAC_EXEMPT
@@ -665,6 +666,7 @@ SCM_RIGHTS
 SCM_CREDENTIALS
 SCM_CREDS
 SCM_TIMESTAMP
+SCM_TIMESTAMPNS
 SCM_UCRED
 
 LOCAL_PEERCRED