diff --git a/extra/calendar/windows/windows.factor b/extra/calendar/windows/windows.factor
index 320400822c..afc040ef75 100755
--- a/extra/calendar/windows/windows.factor
+++ b/extra/calendar/windows/windows.factor
@@ -9,5 +9,4 @@ T{ windows-calendar } calendar-backend set-global
 M: windows-calendar gmt-offset ( -- float )
     "TIME_ZONE_INFORMATION" <c-object>
     [ GetTimeZoneInformation win32-error=0/f ] keep
-    [ TIME_ZONE_INFORMATION-Bias ] keep
-    TIME_ZONE_INFORMATION-DaylightBias + 60 /f neg ;
+    TIME_ZONE_INFORMATION-Bias 60 / neg ;