diff --git a/install/pialert_patch_DB.sh b/install/pialert_patch_DB.sh
index fd99ca26..bc036abb 100755
--- a/install/pialert_patch_DB.sh
+++ b/install/pialert_patch_DB.sh
@@ -1,5 +1,7 @@
 #!/bin/sh
+DB_NAME="pialert.db"
 echo "Create backup before insert new table"
-cp ../db/pialert.db ../db/pialert.db.bak
-echo "Insert new table 'Online_History' to pialert.db"
-sqlite3 ../db/pialert.db  "CREATE TABLE 'Online_History' ('Index' INTEGER, 'Scan_Date' TEXT, 'Online_Devices' INTEGER, 'Down_Devices' INTEGER, 'All_Devices' INTEGER, 'Archived_Devices' INTEGER, PRIMARY KEY('Index' AUTOINCREMENT));"
+cp ../db/$DB_NAME ../db/pialert.db.bak
+echo "Insert new table 'Online_History' to $DB_NAME"
+sqlite3 ../db/$DB_NAME "CREATE TABLE 'Online_History' ('Index' INTEGER, 'Scan_Date' TEXT, 'Online_Devices' INTEGER, 'Down_Devices' INTEGER, 'All_Devices' INTEGER, 'Archived_Devices' INTEGER, PRIMARY KEY('Index' AUTOINCREMENT));"
+