diff --git a/check-disc-usage.sh b/check-disc-usage.sh
index d08c7e8..5ea2207 100755
--- a/check-disc-usage.sh
+++ b/check-disc-usage.sh
@@ -400,7 +400,7 @@ if $found ; then
 
    fi # if $(which lxc-ls > /dev/null)
 
-   SUBJECT="[ Warning ] Hard disk usage (${_percent}) on $(hostname -f) exceeds ${WARN_VALUE}%"
+   SUBJECT="[ Warning ] Hard disk usage (${_percent}%) on $(hostname -f) exceeds ${WARN_VALUE}%"
    SUBJECT_UTF8="$(echo "${SUBJECT}" | iconv -t UTF8)"
    SUBJECT_UTF8_ENCODED="=?utf-8?B?$(echo ${SUBJECT_UTF8} | base64  --wrap=0)?="