diff --git a/usr.sbin/ntp/config.h b/usr.sbin/ntp/config.h
index 30c325f36038..d8c341ca2c26 100644
--- a/usr.sbin/ntp/config.h
+++ b/usr.sbin/ntp/config.h
@@ -1782,3 +1782,8 @@ typedef union mpinfou {
 	# endif
 	#endif	/* !defined(_KERNEL) && !defined(PARSESTREAM) */
 	
+/*
+ * FreeBSD specific: Explicitly specify date/time for reproducible build.
+ */
+#define	MKREPRO_DATE "Jul 04 2015"
+#define	MKREPRO_TIME "15:42:16"