diff --git a/3party/mongoose/mongoose.c b/3party/mongoose/mongoose.c
index b892772..e20e407 100644
--- a/3party/mongoose/mongoose.c
+++ b/3party/mongoose/mongoose.c
@@ -17,7 +17,12 @@
 //
 // SPDX-License-Identifier: GPL-2.0-only or commercial
 
+// fix miss CLOCK_REALTIME
+#define _POSIX_C_SOURCE 200809L
 #include "mongoose.h"
+#include <time.h>
+#include <alloca.h>
+#include <unistd.h>
 
 #ifdef MG_ENABLE_LINES
 #line 1 "src/base64.c"
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 85cd638..ef4f835 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.10)
 
 project(ulib LANGUAGES CXX C VERSION 0.1.0)
-set(CMAKE_C_STANDARD 99)
+set(CMAKE_C_STANDARD 11)
 set(CMAKE_C_STANDARD_REQUIRED ON)
 set(CMAKE_C_EXTENSIONS OFF)
 set(CMAKE_CXX_STANDARD 11)