diff --git a/include/sys/time.h b/include/sys/time.h
index 650166145..611f5dd2d 100644
--- a/include/sys/time.h
+++ b/include/sys/time.h
@@ -46,6 +46,9 @@
 #define	MSEC2NSEC(m)	((hrtime_t)(m) * (NANOSEC / MILLISEC))
 #define	NSEC2MSEC(n)	((n) / (NANOSEC / MILLISEC))
 
+#define NSEC2SEC(n)     ((n) / (NANOSEC / SEC))
+#define SEC2NSEC(m)     ((hrtime_t)(m) * (NANOSEC / SEC))  
+
 static const int hz = HZ;
 
 #define	TIMESPEC_OVERFLOW(ts)		\