diff --git a/plugins/postfix/postfix_stats b/plugins/postfix/postfix_stats
index 86d0926f..315cd1a7 100755
--- a/plugins/postfix/postfix_stats
+++ b/plugins/postfix/postfix_stats
@@ -61,7 +61,7 @@ GPLv2
 #set -xv
 SYS_LOG="${logfiles:-/var/log/syslog /var/log/syslog.0}"
 
-GREP_HOSTNAME=${0##*postfix_stats_}
+GREP_HOSTNAME="${0##*postfix_stats_}"
 
 # shellcheck disable=SC2154
 PFLOGSUMM="${pflogsum}"