diff --git a/repositories/metrics.go b/repositories/metrics.go
index 8c57c07..594fbed 100644
--- a/repositories/metrics.go
+++ b/repositories/metrics.go
@@ -16,7 +16,7 @@ FROM information_schema.tables
 WHERE table_schema = ?
 GROUP BY table_schema`
 
-const sizeTplPostgres = `SELECT pg_database_size('%s');`
+const sizeTplPostgres = `SELECT pg_database_size(?);`
 
 const sizeTplSqlite = `
 SELECT page_count * page_size as size