diff --git a/trunk/src/protocol/srs_http_stack.cpp b/trunk/src/protocol/srs_http_stack.cpp
index 6e46e23e2..8ec6308cd 100644
--- a/trunk/src/protocol/srs_http_stack.cpp
+++ b/trunk/src/protocol/srs_http_stack.cpp
@@ -23,6 +23,7 @@
 
 #include <srs_http_stack.hpp>
 
+#include <stdlib.h>
 #include <sstream>
 using namespace std;