diff --git a/libavutil/parseutils.c b/libavutil/parseutils.c
index 494801e2deeed5f359cc209ac43fea0c32ae91e7..f2f8f18437eb3dc7796eb7d69ef26322030c800a 100644
--- a/libavutil/parseutils.c
+++ b/libavutil/parseutils.c
@@ -519,7 +519,7 @@ time_t av_timegm(struct tm *tm)
         y--;
     }
 
-    t = 86400 *
+    t = 86400LL *
         (d + (153 * m - 457) / 5 + 365 * y + y / 4 - y / 100 + y / 400 - 719469);
 
     t += 3600 * tm->tm_hour + 60 * tm->tm_min + tm->tm_sec;