diff --git a/trunk/src/main/srs_main_server.cpp b/trunk/src/main/srs_main_server.cpp
index c159243e9..b0a1e9dea 100644
--- a/trunk/src/main/srs_main_server.cpp
+++ b/trunk/src/main/srs_main_server.cpp
@@ -37,6 +37,8 @@ using namespace std;
     #include <gperftools/profiler.h>
 #endif
 
+using namespace std;
+
 #include <srs_kernel_error.hpp>
 #include <srs_app_server.hpp>
 #include <srs_app_config.hpp>