diff --git a/src/box/lua/net_box.c b/src/box/lua/net_box.c
index 5efc67b372a67441e84d35486a03f250df2c8d6a..d79f90fd97dcfceee386dd9c81705cbe93b05d91 100644
--- a/src/box/lua/net_box.c
+++ b/src/box/lua/net_box.c
@@ -2749,6 +2749,14 @@ luaT_netbox_transport_stop(struct lua_State *L)
 	return 0;
 }
 
+static int
+luaT_netbox_transport_next_sync(struct lua_State *L)
+{
+	struct netbox_transport *transport = luaT_check_netbox_transport(L, 1);
+	luaL_pushuint64(L, transport->next_sync);
+	return 1;
+}
+
 /**
  * Puts an active connection to 'graceful_shutdown' state, in which no new
  * requests are allowed. The connection will be switched to the error state
@@ -2793,6 +2801,7 @@ luaopen_net_box(struct lua_State *L)
 		{ "__gc",           luaT_netbox_transport_gc },
 		{ "start",          luaT_netbox_transport_start },
 		{ "stop",           luaT_netbox_transport_stop },
+		{ "next_sync",	    luaT_netbox_transport_next_sync },
 		{ "graceful_shutdown",
 			luaT_netbox_transport_graceful_shutdown },
 		{ "perform_request",
diff --git a/src/box/lua/net_box.lua b/src/box/lua/net_box.lua
index 5e4c8d59380ff0b6b3e8aa46c58f45cc3264d3e1..c08fb02ac5d99e75fdcb39050ac293ded1807445 100644
--- a/src/box/lua/net_box.lua
+++ b/src/box/lua/net_box.lua
@@ -748,6 +748,14 @@ function remote_methods:_request(method, opts, format, stream_id, ...)
     return res
 end
 
+function remote_methods:_inject(str, opts)
+    return self:_request(M_INJECT, opts, nil, nil, str)
+end
+
+function remote_methods:_next_sync()
+    return self._transport:next_sync()
+end
+
 function remote_methods:ping(opts)
     check_remote_arg(self, 'ping')
     return (pcall(self._request, self, M_PING, opts, nil, self._stream_id))
diff --git a/test/box-luatest/gh_6305_net_box_autocomplete_test.lua b/test/box-luatest/gh_6305_net_box_autocomplete_test.lua
index 2b4fd42ba3b6d7b746d1cae382de688fb576a100..5976a023126121e166227f6624b617f617f64fd4 100644
--- a/test/box-luatest/gh_6305_net_box_autocomplete_test.lua
+++ b/test/box-luatest/gh_6305_net_box_autocomplete_test.lua
@@ -37,12 +37,12 @@ g.test_autocomplete = function()
                         'conn1:watch(',
                         'conn1:call_16(',
                         'conn1:execute(',
-                        'conn1:prepare(',
                         'conn1:wait_state(',
+                        'conn1:ping(',
                         'conn1:unprepare(',
+                        'conn1:prepare(',
                         'conn1:close(',
                         'conn1:on_connect(',
-                        'conn1:ping(',
                         'conn1:new_stream(',
                         'conn1:is_connected(',
                         'conn1:eval(',