diff --git a/src/include/port/win.h b/src/include/port/win.h
index 7892f92424..b82984e1e3 100644
--- a/src/include/port/win.h
+++ b/src/include/port/win.h
@@ -5,3 +5,7 @@ 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 USE_POSIX_TIME
+#define HAVE_INT_TIMEZONE /* has int _timezone */