diff --git a/libavformat/srtenc.c b/libavformat/srtenc.c
index f50cfbb127..833823839b 100644
--- a/libavformat/srtenc.c
+++ b/libavformat/srtenc.c
@@ -65,7 +65,7 @@ static int srt_write_packet(AVFormatContext *avf, AVPacket *pkt)
         if (d <= 0)
             /* For backward compatibility, fallback to convergence_duration. */
             d = pkt->convergence_duration;
-        if (s == AV_NOPTS_VALUE || d <= 0) {
+        if (s == AV_NOPTS_VALUE || d < 0) {
             av_log(avf, AV_LOG_ERROR, "Insufficient timestamps.\n");
             return AVERROR(EINVAL);
         }