diff --git a/libisoburn/trunk/releng/run_all_releng b/libisoburn/trunk/releng/run_all_releng
index 7940a54b..0f8a755c 100755
--- a/libisoburn/trunk/releng/run_all_releng
+++ b/libisoburn/trunk/releng/run_all_releng
@@ -44,6 +44,12 @@ do
   fi
 done
 #############################################
+if test "$next_is" = x
+then
+       echo >&2
+       echo "Option -x expects an argument (the path to the xorriso program)" >&2
+       exit 31
+fi
 
 if [ ! "${1}" ]; then
 cat << HLP