diff --git a/libavfilter/vsrc_cellauto.c b/libavfilter/vsrc_cellauto.c
index 226182daf2..8c682a7052 100644
--- a/libavfilter/vsrc_cellauto.c
+++ b/libavfilter/vsrc_cellauto.c
@@ -302,6 +302,7 @@ static int request_frame(AVFilterLink *outlink)
     evolve(outlink->src);
 
     picref->pts = s->pts++;
+    picref->duration = 1;
 
 #ifdef DEBUG
     show_cellauto_row(outlink->src);