diff --git a/include/transport/pqxxbackend.h b/include/transport/pqxxbackend.h
index e13c6b037c880d8e413026de52303603ef10fccc..f02d86fc068b43d4b9189b3ca29540dd6bc83411 100644
--- a/include/transport/pqxxbackend.h
+++ b/include/transport/pqxxbackend.h
@@ -98,6 +98,9 @@ class PQXXBackend : public StorageBackend
 	private:
 		bool exec(const std::string &query, bool show_error = true);
 		bool exec(pqxx::work &txn, const std::string &query, bool show_error = true);
+		template<typename T>
+		std::string quote(pqxx::work &txn, const T &t);
+
 		Config *m_config;
 		std::string m_prefix;