diff --git a/newlib/ChangeLog b/newlib/ChangeLog
index d516c6448..bf6dfecdf 100644
--- a/newlib/ChangeLog
+++ b/newlib/ChangeLog
@@ -1,3 +1,7 @@
+2010-08-02  Yaakov Selkowitz  <yselkowitz@users.sourceforge.net>
+
+	* libc/include/sys/features.h: Define _POSIX_MONOTONIC_CLOCK for Cygwin.
+
 2010-08-06  Corinna Vinschen  <corinna@vinschen.de>
 
 	* libc/include/sys/stat.h: Move all POSIX-defined symbolic constants
diff --git a/newlib/libc/include/sys/features.h b/newlib/libc/include/sys/features.h
index 0277fb0a5..2f862687c 100644
--- a/newlib/libc/include/sys/features.h
+++ b/newlib/libc/include/sys/features.h
@@ -112,7 +112,7 @@ extern "C" {
 #define _POSIX_MEMLOCK_RANGE			200112L
 #define _POSIX_MEMORY_PROTECTION		200112L
 #define _POSIX_MESSAGE_PASSING			200112L
-/* #define _POSIX_MONOTONIC_CLOCK		    -1 */
+#define _POSIX_MONOTONIC_CLOCK			200112L
 #define _POSIX_NO_TRUNC				     1
 /* #define _POSIX_PRIORITIZED_IO		    -1 */
 #define _POSIX_PRIORITY_SCHEDULING		200112L