diff --git a/releng/releng_isojigdo b/releng/releng_isojigdo
index 1898dc89..84ca62d3 100755
--- a/releng/releng_isojigdo
+++ b/releng/releng_isojigdo
@@ -34,7 +34,7 @@ Usage:
  ${SELF} -rc [-keep]
 
 # without using a config file
- ${SELF} /path/to/xorriso
+ ${SELF} /path/to/xorriso [-keep]
 
 # cleanup test generated data directory and exit
  ${SELF} -cleanup
@@ -82,8 +82,12 @@ elif [ "${1}" == "-rc" -a ! "${2}" ]; then
   echo -e "\n${SELF}: Config file ${CONFFILE} not found.\n" && exit 4
  fi
 # cmdline option
+elif [ -x "${1}" -a "${2}" == "-keep" ]; then
+ RELENG_XORRISO="${1}"
+ KEEP=1
 elif [ -x "${1}" ]; then
  RELENG_XORRISO="${1}"
+ KEEP=0
 # the rest
 else
  print_help && exit 5