--- ctcstools/do_dbench
+++ ctcstools/do_dbench
@@ -155,7 +155,7 @@
 #                      abort in case of shortage                     
 #
 minfree="$((diskspace_per_client * number_clients))"  # MByte
-freespace="$(df -m "$workdir" | awk '/^\/dev/{ print $4 }')"
+freespace="$(df -m "$workdir" | awk '/^\//{ print $4 }')"
 # if empty, need to consult next line.
 [ -n "$freespace" ] || freespace="$(df "$workdir" |\
     awk '/^\/dev/{ getline ; print $3 }')" 
