diff --git a/code/qcommon/net_ip.c b/code/qcommon/net_ip.c
index bcccda20..621f1ba2 100644
--- a/code/qcommon/net_ip.c
+++ b/code/qcommon/net_ip.c
@@ -46,6 +46,13 @@ typedef int socklen_t;
 typedef unsigned short sa_family_t;
 #	endif
 
+// Undefine existing real error codes and replace
+// with our pretend compatibility layer ones
+#	undef EAGAIN
+#	undef EADDRNOTAVAIL
+#	undef EAFNOSUPPORT
+#	undef ECONNRESET
+
 #	define EAGAIN					WSAEWOULDBLOCK
 #	define EADDRNOTAVAIL	WSAEADDRNOTAVAIL
 #	define EAFNOSUPPORT		WSAEAFNOSUPPORT