diff --git a/ChangeLog b/ChangeLog
index 4a288d173c..8bfd290257 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,7 @@
 2011-05-28  Ulrich Drepper  <drepper@gmail.com>
 
+	* sysdeps/unix/sysv/linux/socketcall.h (SOCKOP_sendmmsg): Define.
+
 	* debug/xtrace.sh: Unify messages.
 	* malloc/memusage.sh: Likewise.
 
diff --git a/sysdeps/unix/sysv/linux/socketcall.h b/sysdeps/unix/sysv/linux/socketcall.h
index bab4e4a510..73d4cb9de9 100644
--- a/sysdeps/unix/sysv/linux/socketcall.h
+++ b/sysdeps/unix/sysv/linux/socketcall.h
@@ -1,5 +1,5 @@
 /* ID for functions called via socketcall system call.
-   Copyright (C) 1995, 1996, 2008, 2009 Free Software Foundation, Inc.
+   Copyright (C) 1995, 1996, 2008, 2009, 2011 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -45,5 +45,6 @@
 #define SOCKOP_recvmsg		17
 #define SOCKOP_accept4		18
 #define SOCKOP_recvmmsg		19
+#define SOCKOP_sendmmsg		20
 
 #endif /* sys/socketcall.h */