diff --git a/libavfilter/vf_minterpolate.c b/libavfilter/vf_minterpolate.c
index 97d0e96c59..f2de61ca39 100644
--- a/libavfilter/vf_minterpolate.c
+++ b/libavfilter/vf_minterpolate.c
@@ -1189,6 +1189,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *avf_in)
 
         av_frame_copy_props(avf_out, mi_ctx->frames[NB_FRAMES - 1].avf);
         avf_out->pts = mi_ctx->out_pts++;
+        avf_out->duration = 1;
 
         interpolate(inlink, avf_out);