diff --git a/xCAT-nbroot2/debian/xcat-genesis-amd64.postinst b/xCAT-nbroot2/debian/xcat-genesis-amd64.postinst
index 58199ddce..feb0937d5 100644
--- a/xCAT-nbroot2/debian/xcat-genesis-amd64.postinst
+++ b/xCAT-nbroot2/debian/xcat-genesis-amd64.postinst
@@ -20,6 +20,9 @@ set -e
 
 case "$1" in
     configure)
+    ;;
+
+    upgrade)
         if [ -f "/proc/cmdline" ]; then   # prevent running it during install into chroot image
 	    . /etc/profile.d/xcat.sh
 	    mknb x86_64