diff --git a/db_bridge/include/postgresql_db.h b/db_bridge/include/postgresql_db.h
--- a/db_bridge/include/postgresql_db.h
+++ b/db_bridge/include/postgresql_db.h
@@ -22,6 +22,6 @@
       PostgreSQL_DB (std::string, std::string, std::string, std::string);
       virtual ~ PostgreSQL_DB ();
       bool connect ();
-      std::vector < std::vector <std::string> >query (std::string);
+      Abstract_DB::DB_RESULT query (std::string);
 };
 #endif