diff --git a/libavfilter/vf_fps.c b/libavfilter/vf_fps.c
index 0e5a1fec35..051d278f54 100644
--- a/libavfilter/vf_fps.c
+++ b/libavfilter/vf_fps.c
@@ -291,6 +291,7 @@ static int write_frame(AVFilterContext *ctx, FPSContext *s, AVFilterLink *outlin
         // Make sure Closed Captions will not be duplicated
         av_frame_remove_side_data(s->frames[0], AV_FRAME_DATA_A53_CC);
         frame->pts = s->next_pts++;
+        frame->duration = 1;
 
         av_log(ctx, AV_LOG_DEBUG, "Writing frame with pts %"PRId64" to pts %"PRId64"\n",
                s->frames[0]->pts, frame->pts);