diff --git a/basis/calendar/windows/windows.factor b/basis/calendar/windows/windows.factor
index caab530a23..65c922f119 100644
--- a/basis/calendar/windows/windows.factor
+++ b/basis/calendar/windows/windows.factor
@@ -1,15 +1,13 @@
 USING: calendar namespaces alien.c-types system
-windows.kernel32 kernel math combinators windows.errors ;
+windows.kernel32 kernel math combinators windows.errors
+classes.struct accessors ;
 IN: calendar.windows
 
 M: windows gmt-offset ( -- hours minutes seconds )
-    "TIME_ZONE_INFORMATION" <c-object>
+    TIME_ZONE_INFORMATION <struct>
     dup GetTimeZoneInformation {
         { TIME_ZONE_ID_INVALID [ win32-error-string throw ] }
-        { TIME_ZONE_ID_UNKNOWN [ TIME_ZONE_INFORMATION-Bias ] }
-        { TIME_ZONE_ID_STANDARD [ TIME_ZONE_INFORMATION-Bias ] }
-        { TIME_ZONE_ID_DAYLIGHT [
-            [ TIME_ZONE_INFORMATION-Bias ]
-            [ TIME_ZONE_INFORMATION-DaylightBias ] bi +
-        ] }
+        { TIME_ZONE_ID_UNKNOWN [ Bias>> ] }
+        { TIME_ZONE_ID_STANDARD [ Bias>> ] }
+        { TIME_ZONE_ID_DAYLIGHT [ [ Bias>> ] [ DaylightBias>> ] bi + ] }
     } case neg 60 /mod 0 ;
diff --git a/basis/windows/kernel32/kernel32.factor b/basis/windows/kernel32/kernel32.factor
index 50a03945f3..30007bb5a0 100755
--- a/basis/windows/kernel32/kernel32.factor
+++ b/basis/windows/kernel32/kernel32.factor
@@ -226,14 +226,14 @@ STRUCT: SYSTEMTIME
     { wSecond WORD }
     { wMilliseconds WORD } ;
 
-C-STRUCT: TIME_ZONE_INFORMATION
-    { "LONG" "Bias" }
-    { { "WCHAR" 32 } "StandardName" }
-    { "SYSTEMTIME" "StandardDate" }
-    { "LONG" "StandardBias" }
-    { { "WCHAR" 32 } "DaylightName" }
-    { "SYSTEMTIME" "DaylightDate" }
-    { "LONG" "DaylightBias" } ;
+STRUCT: TIME_ZONE_INFORMATION
+    { Bias LONG }
+    { StandardName WCHAR[32] }
+    { StandardDate SYSTEMTIME }
+    { StandardBias LONG }
+    { DaylightName WCHAR[32] }
+    { DaylightDate SYSTEMTIME }
+    { DaylightBias LONG } ;
 
 STRUCT: FILETIME
     { dwLowDateTime DWORD }