diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1c40ab9e1a841fce74bef58ef4f78fd369b7ee55..46780af7309c2609a088f6a6bd0fcb9f533b94f0 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,6 +2,7 @@ cmake_minimum_required( VERSION 3.8 )
 include(CheckCXXCompilerFlag)
 
 project(CMINUSF)
+add_compile_definitions(_POSIX_C_SOURCE=200112L)
 
 set(CMAKE_C_FLAGS "${CMAKE_CXX_FLAGS} -std=c99")
 
diff --git a/include/lightir/Type.hpp b/include/lightir/Type.hpp
index c0041e6c695a2aa4eafe8e455c0eaa7617e00f41..791577652b40a493a8466bfa0696ee8898e650bd 100755
--- a/include/lightir/Type.hpp
+++ b/include/lightir/Type.hpp
@@ -2,6 +2,7 @@
 
 #include <iostream>
 #include <vector>
+#include <cstdint>
 
 class Module;
 class IntegerType;
diff --git a/src/common/util.cpp b/src/common/util.cpp
index 4af9cecb71240e41d2dd364105547a95ca92575a..83cec45a80d7c8815eb6f47bb1f0f413401ba188 100644
--- a/src/common/util.cpp
+++ b/src/common/util.cpp
@@ -1,4 +1,5 @@
 #include "util.hpp"
+#include <cstdint>
 
 std::string ptr_to_str(const void* ptr)
 {