diff --git a/modules/setting/database.go b/modules/setting/database.go
index 7d082d137..3d13ee10c 100644
--- a/modules/setting/database.go
+++ b/modules/setting/database.go
@@ -62,6 +62,11 @@ func InitDBConfig() {
 	sec := Cfg.Section("database")
 	Database.Type = sec.Key("DB_TYPE").String()
 	defaultCharset := "utf8"
+	Database.UseMySQL = false
+	Database.UseSQLite3 = false
+	Database.UsePostgreSQL = false
+	Database.UseMSSQL = false
+
 	switch Database.Type {
 	case "sqlite3":
 		Database.UseSQLite3 = true