diff --git a/basis/windows/time/time.factor b/basis/windows/time/time.factor
index dfe12aaf3c..904c85200e 100644
--- a/basis/windows/time/time.factor
+++ b/basis/windows/time/time.factor
@@ -8,8 +8,7 @@ IN: windows.time
 : >64bit ( lo hi -- n )
     32 shift bitor ; inline
 
-: windows-1601 ( -- timestamp )
-    1601 1 1 0 0 0 instant <timestamp> ;
+: windows-1601 ( -- timestamp ) 1601 <year-gmt> ;
 
 : FILETIME>windows-time ( FILETIME -- n )
     [ dwLowDateTime>> ] [ dwHighDateTime>> ] bi >64bit ;