diff --git a/src/include/port/win.h b/src/include/port/win.h
index 52725a1e1af6bd7c2e79eb2790f093ec4527cf8f..08b08904255ebf95a9da6a7839488b7d868d0167 100644
--- a/src/include/port/win.h
+++ b/src/include/port/win.h
@@ -1,10 +1,6 @@
 #define HAS_TEST_AND_SET
 typedef unsigned char slock_t;
 
-#ifndef O_DIROPEN
-#define O_DIROPEN	0x100000	/* should be in sys/fcntl.h */
-#endif
-
 #define tzname _tzname			/* should be in time.h? */
 #define HAVE_INT_TIMEZONE		/* has int _timezone */