diff --git a/trunk/src/app/srs_app_coworkers.cpp b/trunk/src/app/srs_app_coworkers.cpp
index 55eac270d..66c5272d8 100644
--- a/trunk/src/app/srs_app_coworkers.cpp
+++ b/trunk/src/app/srs_app_coworkers.cpp
@@ -23,6 +23,7 @@
 
 #include <srs_app_coworkers.hpp>
 
+#include <stdlib.h>
 using namespace std;
 
 #include <srs_protocol_json.hpp>