diff --git a/changes.txt b/changes.txt
index 0084ba0..1b6e794 100644
--- a/changes.txt
+++ b/changes.txt
@@ -1,5 +1,8 @@
 Version XXX:
 	Bugfix: Allow address reuse when only the binding socket has SO_REUSEADDR.
+	
+	Bugfix: Initialise the ptype of IPX sockets created with a nonzero
+	protocol value correctly.
 
 Version 0.4.1:
 	Feature: Added workaround for point-to-point links.
diff --git a/src/winsock.c b/src/winsock.c
index c3968d2..d6232c9 100644
--- a/src/winsock.c
+++ b/src/winsock.c
@@ -178,7 +178,7 @@ SOCKET WSAAPI socket(int af, int type, int protocol)
 			}
 			
 			nsock->flags = IPX_SEND | IPX_RECV | IPX_RECV_BCAST;
-			nsock->s_ptype = (protocol ? NSPROTO_IPX - protocol : 0);
+			nsock->s_ptype = (protocol ? protocol - NSPROTO_IPX : 0);
 			
 			log_printf(LOG_INFO, "IPX socket created (fd = %d)", nsock->fd);