diff --git a/libavfilter/vsrc_life.c b/libavfilter/vsrc_life.c
index d40c38b953..9f83ca5e18 100644
--- a/libavfilter/vsrc_life.c
+++ b/libavfilter/vsrc_life.c
@@ -404,6 +404,7 @@ static int request_frame(AVFilterLink *outlink)
         return AVERROR(ENOMEM);
     picref->sample_aspect_ratio = (AVRational) {1, 1};
     picref->pts = life->pts++;
+    picref->duration = 1;
 
     life->draw(outlink->src, picref);
     evolve(outlink->src);