diff --git a/Build.sh b/Build.sh
index 4c52733..e34f93f 100644
--- a/Build.sh
+++ b/Build.sh
@@ -1,5 +1,5 @@
 #!/bin/sh
-srcversion='$MirOS: src/bin/mksh/Build.sh,v 1.724 2017/05/05 22:59:36 tg Exp $'
+srcversion='$MirOS: src/bin/mksh/Build.sh,v 1.725 2017/05/15 13:35:38 tg Exp $'
 #-
 # Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
 #		2011, 2012, 2013, 2014, 2015, 2016, 2017
@@ -800,6 +800,7 @@ Harvey)
 	add_cppflags -DMKSH__NO_SETEUGID
 	oswarn=' and will currently not work'
 	add_cppflags -DMKSH_UNEMPLOYED
+	add_cppflags -DMKSH_NOPROSPECTOFWORK
 	# these taken from Harvey-OS github and need re-checking
 	add_cppflags -D_setjmp=setjmp -D_longjmp=longjmp
 	: "${HAVE_CAN_NO_EH_FRAME=0}"