Index: otp/erts/emulator/sys/win32/erl_win_sys.h
===================================================================
--- otp.orig/erts/emulator/sys/win32/erl_win_sys.h	2011-12-17 19:53:02.000000000 +0200
+++ otp/erts/emulator/sys/win32/erl_win_sys.h	2011-12-17 20:18:04.000000000 +0200
@@ -126,7 +126,11 @@
 #define SYS_CLK_TCK 1000
 #define SYS_CLOCK_RESOLUTION 1
 
-#if SIZEOF_TIME_T != 8
+#if SIZEOF_TIME_T == 4
+typedef __time32_t erts_time_t;
+#elif SIZEOF_TIME_T == 8
+typedef __time64_t erts_time_t;
+#else
 #  error "Unexpected sizeof(time_t)"
 #endif
 
@@ -135,7 +139,6 @@
  * Types seen in beam_emu.c *need* to have the same size
  * as in the rest of the system...
  */
-typedef __int64 erts_time_t;
 
 struct tm *sys_localtime_r(time_t *epochs, struct tm *ptm);
 struct tm *sys_gmtime_r(time_t *epochs, struct tm *ptm);