diff --git a/plugins/disk/dm_cache_occupancy_ b/plugins/disk/dm_cache_occupancy_
index cddee218..3d45b5fd 100755
--- a/plugins/disk/dm_cache_occupancy_
+++ b/plugins/disk/dm_cache_occupancy_
@@ -50,7 +50,10 @@ GPLv2
 
 CVOL=${0##*dm_cache_occupancy_}
 #workaround for http://munin-monitoring.org/ticket/1236
-CVOL=${CVOL/____/-}
+while [[ $CVOL == *"____"* ]]
+do
+	CVOL=${CVOL/____/-}
+done
 
 case $1 in
 	autoconf)