diff --git a/savevm.c b/savevm.c
index 12fb209..2d18bab 100644
--- a/savevm.c
+++ b/savevm.c
@@ -2106,7 +2106,8 @@
         }
     } else {
 #ifdef _WIN32
-        ptm = localtime(&tb.time);
+        time_t t = tb.time;
+        ptm = localtime(&t);
         strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", ptm);
 #else
         /* cast below needed for OpenBSD where tv_sec is still 'long' */