diff --git a/trunk/src/core/srs_core_time.hpp b/trunk/src/core/srs_core_time.hpp
index bfcbbf1a7..01d1939dc 100644
--- a/trunk/src/core/srs_core_time.hpp
+++ b/trunk/src/core/srs_core_time.hpp
@@ -7,10 +7,14 @@
 #ifndef SRS_CORE_TIME_HPP
 #define SRS_CORE_TIME_HPP
 
-#include <srs_core.hpp>
-
 // Time and duration unit, in us.
+#if defined(_WIN32) && !defined(__MINGW32__) && (!defined(_MSC_VER) || _MSC_VER<1600) && !defined(__WINE__)
+#include <BaseTsd.h>
+typedef __int64 srs_utime_t;
+#else
+#include <stdint.h>
 typedef int64_t srs_utime_t;
+#endif
 
 // The time unit in ms, for example 100 * SRS_UTIME_MILLISECONDS means 100ms.
 #define SRS_UTIME_MILLISECONDS 1000