diff --git a/common/rdr/FdOutStream.cxx b/common/rdr/FdOutStream.cxx
index 533faa3..83360d6 100644
--- a/common/rdr/FdOutStream.cxx
+++ b/common/rdr/FdOutStream.cxx
@@ -26,11 +26,9 @@
 #ifdef _WIN32
 #include <winsock2.h>
 #define write(s,b,l) send(s,(const char*)b,l,0)
-#define EWOULDBLOCK WSAEWOULDBLOCK
 #undef errno
 #define errno WSAGetLastError()
-#undef EINTR
-#define EINTR WSAEINTR
+#include <os/winerrno.h>
 #else
 #include <sys/types.h>
 #include <errno.h>