diff --git a/nodemgmt-scripts.sh b/nodemgmt-scripts.sh
index 24a2059b..afda0f93 100755
--- a/nodemgmt-scripts.sh
+++ b/nodemgmt-scripts.sh
@@ -538,7 +538,7 @@ CHECK_DOCKER_SERVICES(){
 					for docker in "${!dockers}"; do
 						if [ "${ST_ACTION}" != "check" ]; then
 							c=0; cw=30; spc=''
-							spc1=${cw}-${#NM_DOCKERS[${docker}]}
+							spc1=`expr ${cw} - ${#NM_DOCKERS[${docker}]}`
 							echo "$spc1"
 							#until [ $c = ${spc1} ]; do spc="${spc} "; c=`expr $c + 1`; done
 							echo -en " ${NM_DOCKERS[${docker}]}$spc: "