diff --git a/ports/win32/sys_arch.c b/ports/win32/sys_arch.c
index 8116186..3a0c1d0 100644
--- a/ports/win32/sys_arch.c
+++ b/ports/win32/sys_arch.c
@@ -56,6 +56,11 @@ static LONGLONG sys_get_ms_longlong()
 {
   LONGLONG ret;
   LARGE_INTEGER now;
+#if NO_SYS
+  if (freq.QuadPart == 0) {
+    sys_init_timing();
+  }
+#endif /* NO_SYS */
   QueryPerformanceCounter(&now);
   ret = now.QuadPart-sys_start_time.QuadPart;
   return (u32_t)(((ret)*1000)/freq.QuadPart);