diff --git a/platform/javascript/http_request.h b/platform/javascript/http_request.h
index 80ff3f0ba84..06d9239004a 100644
--- a/platform/javascript/http_request.h
+++ b/platform/javascript/http_request.h
@@ -34,6 +34,8 @@
 extern "C" {
 #endif
 
+#include "stddef.h"
+
 typedef enum {
 	XHR_READY_STATE_UNSENT = 0,
 	XHR_READY_STATE_OPENED = 1,