diff --git a/include/transport/pqxxbackend.h b/include/transport/pqxxbackend.h
index 21d54339cf20ceedebc7fad15e293bea4a286978..e13c6b037c880d8e413026de52303603ef10fccc 100644
--- a/include/transport/pqxxbackend.h
+++ b/include/transport/pqxxbackend.h
@@ -97,6 +97,7 @@ 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);
 		Config *m_config;
 		std::string m_prefix;