diff --git a/mysql/files/save_mysql_processlist.sh b/mysql/files/save_mysql_processlist.sh
index 95abc57d..e03036dd 100644
--- a/mysql/files/save_mysql_processlist.sh
+++ b/mysql/files/save_mysql_processlist.sh
@@ -7,7 +7,7 @@ processlist() {
 }
 
 DIR="/var/log/mysql-processlist"
-TS=`date +%Y%m%d%H%M%S`
+TS=$(date +%Y%m%d%H%M%S)
 FILE="${DIR}/${TS}"
 
 if [ ! -d "${DIR}" ]; then