diff --git a/ChangeLog b/ChangeLog
index bc73ba35bc..8a55e9da7b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 2011-05-21  Ulrich Drepper  <drepper@gmail.com>
 
+	* sysdeps/unix/sysv/linux/bits/time.h: Define CLOCK_REALTIME_ALARM
+	and CLOCK_BOOTTIME_ALARM.
+
 	[BZ #12782]
 	* string/xpg-strerror.c (__xpg_strerror_r): Fill buffer even if error
 	is returned.
diff --git a/sysdeps/unix/sysv/linux/bits/time.h b/sysdeps/unix/sysv/linux/bits/time.h
index a0d4b7823f..40f9a64fa3 100644
--- a/sysdeps/unix/sysv/linux/bits/time.h
+++ b/sysdeps/unix/sysv/linux/bits/time.h
@@ -73,6 +73,10 @@ extern long int __sysconf (int);
 #   define CLOCK_MONOTONIC_COARSE	6
 /* Monotonic system-wide clock that includes time spent in suspension.  */
 #   define CLOCK_BOOTTIME		7
+/* Like CLOCK_REALTIME but also wakes suspended system.  */
+#   define CLOCK_REALTIME_ALARM		8
+/* Like CLOCK_BOOTTIME but also wakes suspended system.  */
+#   define CLOCK_BOOTTIME_ALARM		9
 
 /* Flag to indicate time is absolute.  */
 #   define TIMER_ABSTIME		1