diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index 327eade88d..f2794f41b8 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -3659,7 +3659,9 @@ static CueDesc get_cue_desc(AVFormatContext *s, int64_t ts, int64_t cues_start)
     int i;
     int nb_index_entries = s->streams[0]->nb_index_entries;
     AVIndexEntry *index_entries = s->streams[0]->index_entries;
-    if (ts >= matroska->duration * matroska->time_scale) return (CueDesc) {-1, -1, -1, -1};
+
+    if (ts >= (int64_t)(matroska->duration * matroska->time_scale))
+        return (CueDesc) {-1, -1, -1, -1};
     for (i = 1; i < nb_index_entries; i++) {
         if (index_entries[i - 1].timestamp * matroska->time_scale <= ts &&
             index_entries[i].timestamp * matroska->time_scale > ts) {