diff --git a/libavformat/hls.c b/libavformat/hls.c
index 8204f55df3..b736f093a9 100644
--- a/libavformat/hls.c
+++ b/libavformat/hls.c
@@ -837,10 +837,10 @@ static int parse_playlist(HLSContext *c, const char *url,
             if (ret < 0)
                 goto fail;
             seq_no = strtoull(ptr, NULL, 10);
-            if (seq_no > INT64_MAX) {
+            if (seq_no > INT64_MAX/2) {
                 av_log(c->ctx, AV_LOG_DEBUG, "MEDIA-SEQUENCE higher than "
-                        "INT64_MAX, mask out the highest bit\n");
-                seq_no &= INT64_MAX;
+                        "INT64_MAX/2, mask out the highest bit\n");
+                seq_no &= INT64_MAX/2;
             }
             pls->start_seq_no = seq_no;
         } else if (av_strstart(line, "#EXT-X-PLAYLIST-TYPE:", &ptr)) {