diff --git a/platform/javascript/javascript_main.cpp b/platform/javascript/javascript_main.cpp
index 87699271a02a..9a01c73d67a8 100644
--- a/platform/javascript/javascript_main.cpp
+++ b/platform/javascript/javascript_main.cpp
@@ -33,6 +33,7 @@
 #include "platform/javascript/os_javascript.h"
 
 #include <emscripten/emscripten.h>
+#include <stdlib.h>
 
 static OS_JavaScript *os = NULL;
 static uint64_t target_ticks = 0;