diff --git a/libavformat/avidec.c b/libavformat/avidec.c
index 3ff515d492f96..bafe1dc8da0c4 100644
--- a/libavformat/avidec.c
+++ b/libavformat/avidec.c
@@ -670,7 +670,7 @@ FF_ENABLE_DEPRECATION_WARNINGS
             st->start_time = 0;
             avio_rl32(pb); /* buffer size */
             avio_rl32(pb); /* quality */
-            if (ast->cum_len*ast->scale/ast->rate > 3600) {
+            if (ast->cum_len > 3600LL * ast->rate / ast->scale) {
                 av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
                 ast->cum_len = 0;
             }