diff --git a/sources/auth_query.c b/sources/auth_query.c
new file mode 100644
index 00000000..03072c5e
--- /dev/null
+++ b/sources/auth_query.c
@@ -0,0 +1,57 @@
+
+/*
+ * Odissey.
+ *
+ * Advanced PostgreSQL connection pooler.
+*/
+
+#include <stdlib.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <inttypes.h>
+#include <signal.h>
+
+#include <machinarium.h>
+#include <shapito.h>
+
+#include "sources/macro.h"
+#include "sources/version.h"
+#include "sources/error.h"
+#include "sources/atomic.h"
+#include "sources/list.h"
+#include "sources/pid.h"
+#include "sources/id.h"
+#include "sources/logger.h"
+#include "sources/daemon.h"
+#include "sources/scheme.h"
+#include "sources/scheme_mgr.h"
+#include "sources/config.h"
+#include "sources/msg.h"
+#include "sources/system.h"
+#include "sources/server.h"
+#include "sources/server_pool.h"
+#include "sources/client.h"
+#include "sources/client_pool.h"
+#include "sources/route_id.h"
+#include "sources/route.h"
+#include "sources/route_pool.h"
+#include "sources/io.h"
+#include "sources/instance.h"
+#include "sources/router.h"
+#include "sources/pooler.h"
+#include "sources/relay.h"
+#include "sources/frontend.h"
+#include "sources/backend.h"
+#include "sources/auth.h"
+#include "sources/auth_query.h"
+
+int od_auth_query(od_instance_t *instance, od_schemeroute_t *scheme,
+                  shapito_password_t *password)
+{
+	(void)instance;
+	(void)scheme;
+	(void)password;
+	return 0;
+}
diff --git a/sources/auth_query.h b/sources/auth_query.h
new file mode 100644
index 00000000..9e311a33
--- /dev/null
+++ b/sources/auth_query.h
@@ -0,0 +1,14 @@
+#ifndef OD_AUTH_QUERY_H
+#define OD_AUTH_QUERY_H
+
+/*
+ * Odissey.
+ *
+ * Advanced PostgreSQL connection pooler.
+*/
+
+int
+od_auth_query(od_instance_t *instance, od_schemeroute_t *scheme,
+              shapito_password_t *password);
+
+#endif /* OD_AUTH_QUERY_H */