diff --git a/Source/HBIOS/Build.sh b/Source/HBIOS/Build.sh
index d727319e..697354dd 100755
--- a/Source/HBIOS/Build.sh
+++ b/Source/HBIOS/Build.sh
@@ -124,8 +124,10 @@ if [ -d ../RomDsk/$platform ] ; then
 fi
 
 echo "adding apps to $romdiskfile"
-for i in assign fdu format mode osldr rtc survey syscopy sysgen talk timer xm inttest ; do
+for i in $Apps ; do
+	set +e
 	f=$(../../Tools/unix/casefn.sh ../../Binary/Apps/$i.com)
+	set -e
 	if [ -z "$f" ] ; then
 		echo " " $i "not found"
 	else