diff --git a/upgrade/Monit.sh b/upgrade/Monit.sh
index 082a5475048d4f28a3a1d6f2af2be2e759faa5c1..ada60aaeb57857958fe12b5652d60ca069494f9a 100644
--- a/upgrade/Monit.sh
+++ b/upgrade/Monit.sh
@@ -30,7 +30,7 @@ echo "" > ./$$-parts
 for part in "${list_of_part[@]}"
 do
     name=$(echo $part | sed -e 's@^/$@root@' -e 's@^/@@')
-    echo -e "check device $name with path $part\n    if SPACE usage > ${MEM_OVERLOAD_PERCENT:-75}% then alert\n\n" >> ./$$-parts
+    echo -e "check device $name with path $part\n    if SPACE usage > ${DISC_OVERLOAD_PERCENT:-75}% then alert\n\n" >> ./$$-parts
 done
 mv ./$$-parts /etc/monit/conf-available/disc
 ln -s /etc/monit/conf-available/disc /etc/monit/conf-enabled/