diff --git a/librtmp/rtmp_sys.h b/librtmp/rtmp_sys.h
index 0874cbe..b43d587 100644
--- a/librtmp/rtmp_sys.h
+++ b/librtmp/rtmp_sys.h
@@ -37,6 +37,11 @@
 #include <ws2tcpip.h>
 #endif
 
+#ifdef _MSC_VER
+#define strncasecmp _strnicmp
+#define strcasecmp _stricmp
+#endif
+
 #define GetSockError()	WSAGetLastError()
 #define SetSockError(e)	WSASetLastError(e)
 #define setsockopt(a,b,c,d,e)	(setsockopt)(a,b,c,(const char *)d,(int)e)