diff --git a/libavfilter/af_rubberband.c b/libavfilter/af_rubberband.c
index 1dfd74422c..b42e67f09b 100644
--- a/libavfilter/af_rubberband.c
+++ b/libavfilter/af_rubberband.c
@@ -212,6 +212,7 @@ static int process_command(AVFilterContext *ctx, const char *cmd, const char *ar
 
     rubberband_set_time_ratio(s->rbs, 1. / s->tempo);
     rubberband_set_pitch_scale(s->rbs, s->pitch);
+    s->nb_samples = rubberband_get_samples_required(s->rbs);
 
     return 0;
 }