diff --git a/modules/libcom/src/osi/os/cygwin32/osdSock.h b/modules/libcom/src/osi/os/cygwin32/osdSock.h
index 123f2404f..edb30c55e 100644
--- a/modules/libcom/src/osi/os/cygwin32/osdSock.h
+++ b/modules/libcom/src/osi/os/cygwin32/osdSock.h
@@ -26,6 +26,9 @@
 #include <net/if.h>
 #include <netdb.h>
 #include <unistd.h> /* close() and others */
+#ifndef TCP_NODELAY
+#  include <netinet/tcp.h>
+#endif
 
 
 typedef int                     SOCKET;