diff --git a/Core/src/ThreadGroup.cpp b/Core/src/ThreadGroup.cpp
index b44c80c..12a2aec 100644
--- a/Core/src/ThreadGroup.cpp
+++ b/Core/src/ThreadGroup.cpp
@@ -1,5 +1,8 @@
 #include "ThreadGroup.h"
 
+#include <stdlib.h>
+#include <stdio.h>
+
 #include <boost/thread/thread.hpp>
 #include <boost/thread/barrier.hpp>