diff --git a/code/nel/src/net/sock.cpp b/code/nel/src/net/sock.cpp
index b8d116962..475548821 100644
--- a/code/nel/src/net/sock.cpp
+++ b/code/nel/src/net/sock.cpp
@@ -51,6 +51,11 @@
 #	define ERROR_WOULDBLOCK EWOULDBLOCK
 #	define ERROR_MSG strerror(errno)
 
+// BSD compatible constant
+#	ifndef FNDELAY
+#		define FNDELAY O_NDELAY
+#	endif
+
 typedef int SOCKET;
 
 #endif