diff --git a/plugins/postfix/postfix_stats b/plugins/postfix/postfix_stats
index b5509f4e..12da3c9a 100755
--- a/plugins/postfix/postfix_stats
+++ b/plugins/postfix/postfix_stats
@@ -66,7 +66,7 @@ GPLv2
 #set -xv
 MAIL_LOG="${logfiles:-/var/log/mail.log /var/log/mail.log.1}"
 
-GREP_HOSTNAME=$(basename "$0" | sed -r 's/postfix_stats_?//')
+FILTER_HOSTNAME=$(basename "$0" | sed -r 's/postfix_stats_?//')
 
 # shellcheck disable=SC2154
 PFLOGSUMM="${pflogsum}"
@@ -93,8 +93,8 @@ fi
 # Config Section
 #
 if [ "$1" = 'config' ]; then
-	if [ -n "${GREP_HOSTNAME}" ]; then
-		echo "graph_title Postfix statistics for ${GREP_HOSTNAME}"
+	if [ -n "${FILTER_HOSTNAME}" ]; then
+		echo "graph_title Postfix statistics for ${FILTER_HOSTNAME}"
 	else
 		echo 'graph_title Postfix statistics'
 	fi
@@ -121,8 +121,8 @@ fi
 
 # Variable to store the pflogsumm result.
 # shellcheck disable=SC2086
-if [ -n "${GREP_HOSTNAME}" ]; then
-	TMP_RAW=$(grep -h " ${GREP_HOSTNAME} postfix/" ${MAIL_LOG} | "${PFLOGSUMM}" -d today --detail 0 --zero-fill)
+if [ -n "${FILTER_HOSTNAME}" ]; then
+	TMP_RAW=$(grep -h " ${FILTER_HOSTNAME} postfix/" ${MAIL_LOG} | "${PFLOGSUMM}" -d today --detail 0 --zero-fill)
 else
 	TMP_RAW=$("${PFLOGSUMM}" -d today --detail 0 --zero-fill ${MAIL_LOG})
 fi