diff --git a/libavformat/network.h b/libavformat/network.h
index 7f467304a80e702bb3ea5d9f12872d2a4b2e3f12..71347e815b03c45cbf8c751dbb128af763c6b92b 100644
--- a/libavformat/network.h
+++ b/libavformat/network.h
@@ -50,6 +50,9 @@
 #ifndef EINPROGRESS
 #define EINPROGRESS     WSAEINPROGRESS
 #endif
+#ifndef ENOTCONN
+#define ENOTCONN        WSAENOTCONN
+#endif
 
 #define getsockopt(a, b, c, d, e) getsockopt(a, b, c, (char*) d, e)
 #define setsockopt(a, b, c, d, e) setsockopt(a, b, c, (const char*) d, e)