diff --git a/trunk/src/protocol/srs_http_stack.cpp b/trunk/src/protocol/srs_http_stack.cpp
index 8ec6308cd..35818d1ea 100644
--- a/trunk/src/protocol/srs_http_stack.cpp
+++ b/trunk/src/protocol/srs_http_stack.cpp
@@ -25,6 +25,7 @@
 
 #include <stdlib.h>
 #include <sstream>
+#include <algorithm>
 using namespace std;
 
 #include <srs_kernel_error.hpp>