diff --git a/db.go b/db.go
index 86bc6efb8..01f26a8eb 100644
--- a/db.go
+++ b/db.go
@@ -16,13 +16,13 @@ func OpenDBWithDriver(driver string, dbstring string) (*sql.DB, error) {
 	case "mssql":
 		driver = "sqlserver"
 	case "redshift":
-		driver = "postgres"
+		driver = "pgx"
 	case "tidb":
 		driver = "mysql"
 	}
 
 	switch driver {
-	case "postgres", "pgx", "sqlite3", "sqlite", "mysql", "sqlserver", "clickhouse", "vertica", "azuresql":
+	case "pgx", "sqlite3", "sqlite", "mysql", "sqlserver", "clickhouse", "vertica", "azuresql":
 		return sql.Open(driver, dbstring)
 	default:
 		return nil, fmt.Errorf("unsupported driver %s", driver)