diff --git a/gpgs/src/gpgs_callback.cpp b/gpgs/src/gpgs_callback.cpp
index 678046d..3247bf4 100644
--- a/gpgs/src/gpgs_callback.cpp
+++ b/gpgs/src/gpgs_callback.cpp
@@ -1,6 +1,7 @@
 #if defined(DM_PLATFORM_IOS) || defined(DM_PLATFORM_ANDROID)
 #include "private_gpgs_callback.h"
 #include "utils/LuaUtils.h"
+#include <stdlib.h>
 
 static GPGS_callback            m_callback;
 static dmArray<CallbackData>    m_callbacksQueue;