diff --git a/include/sys.h b/include/sys.h
index 7238f3bab..b71d93998 100644
--- a/include/sys.h
+++ b/include/sys.h
@@ -207,6 +207,7 @@ static const struct in6_addr in6addr_any = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 #define P_EWOULDBLOCK   EWOULDBLOCK
 #define P_EAGAIN        EAGAIN
 #define P_EINPROGRESS   EINPROGRESS
+#define P_EWORKING		EINPROGRESS
 #define P_EINTR         EINTR
 #define P_ETIMEDOUT     ETIMEDOUT
 #define P_ENOTSOCK	ENOTSOCK
@@ -227,6 +228,7 @@ static const struct in6_addr in6addr_any = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 #define P_EWOULDBLOCK   WSAEWOULDBLOCK
 #define P_EAGAIN        WSAEWOULDBLOCK
 #define P_EINPROGRESS   WSAEINPROGRESS
+#define P_EWORKING		WSAEWOULDBLOCK
 #define P_EINTR         WSAEINTR
 #define P_ETIMEDOUT     WSAETIMEDOUT
 #define P_ENOTSOCK	WSAENOTSOCK