diff --git a/libavformat/segment.c b/libavformat/segment.c
index 05e29d427a..dca7822f24 100644
--- a/libavformat/segment.c
+++ b/libavformat/segment.c
@@ -646,7 +646,7 @@ static int seg_write_packet(AVFormatContext *s, AVPacket *pkt)
         end_pts = seg->segment_count < seg->nb_times ?
             seg->times[seg->segment_count] : INT64_MAX;
     } else if (seg->frames) {
-        start_frame = seg->segment_count <= seg->nb_frames ?
+        start_frame = seg->segment_count < seg->nb_frames ?
             seg->frames[seg->segment_count] : INT_MAX;
     } else {
         end_pts = seg->time * (seg->segment_count+1);