diff --git a/doc/lua-api/index.rst b/doc/lua-api/index.rst
index 66d5da67f..deef2618d 100644
--- a/doc/lua-api/index.rst
+++ b/doc/lua-api/index.rst
@@ -1158,6 +1158,14 @@ Server class
    server.
   :returns: a boolean
 
+.. js:function:: Server.is_backup(sv)
+
+  Return true if the server is a backup server
+
+  :param class_server sv: A :ref:`server_class` which indicates the manipulated
+   server.
+  :returns: a boolean
+
 .. js:function:: Server.set_maxconn(sv, weight)
 
   Dynamically change the maximum connections of the server. See the management
diff --git a/src/hlua_fcn.c b/src/hlua_fcn.c
index 639a1ef01..dc9ded4aa 100644
--- a/src/hlua_fcn.c
+++ b/src/hlua_fcn.c
@@ -1072,6 +1072,20 @@ int hlua_server_is_draining(lua_State *L)
 	return 1;
 }
 
+int hlua_server_is_backup(lua_State *L)
+{
+	struct server *srv;
+
+	srv = hlua_check_server(L, 1);
+	if (srv == NULL) {
+		lua_pushnil(L);
+		return 1;
+	}
+
+	lua_pushboolean(L, (srv->flags & SRV_F_BACKUP));
+	return 1;
+}
+
 int hlua_server_set_maxconn(lua_State *L)
 {
 	struct server *srv;
@@ -1422,6 +1436,7 @@ int hlua_fcn_new_server(lua_State *L, struct server *srv)
 	hlua_class_function(L, "get_puid", hlua_server_get_puid);
 	hlua_class_function(L, "get_rid", hlua_server_get_rid);
 	hlua_class_function(L, "is_draining", hlua_server_is_draining);
+	hlua_class_function(L, "is_backup", hlua_server_is_backup);
 	hlua_class_function(L, "set_maxconn", hlua_server_set_maxconn);
 	hlua_class_function(L, "get_maxconn", hlua_server_get_maxconn);
 	hlua_class_function(L, "set_weight", hlua_server_set_weight);