diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index 8e9b3ac81..5b224913a 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,8 @@
+Sat Mar 17 18:10:00 2001  Corinna Vinschen <corinna@vinschen.de>
+
+	* net.cc (cygwin_socket): Set protocol to 0 when address family is
+	AF_UNIX to avoid WSAEPROTONOSUPPORT error.
+
 Sat Mar 17 09:51:32 2001  Mathew Brozowski <brozow@tavve.com>
 
 	* net.cc (cygwin_socket): Pass protocol parameter to socket call.
diff --git a/winsup/cygwin/net.cc b/winsup/cygwin/net.cc
index ee95f7ac5..f0cf9a758 100644
--- a/winsup/cygwin/net.cc
+++ b/winsup/cygwin/net.cc
@@ -352,7 +352,7 @@ cygwin_socket (int af, int type, int protocol)
     {
       debug_printf ("socket (%d, %d, %d)", af, type, protocol);
 
-      soc = socket (AF_INET, type, protocol);
+      soc = socket (AF_INET, type, af == AF_UNIX ? 0 : protocol);
 
       if (soc == INVALID_SOCKET)
 	{