diff --git a/libavfilter/af_adelay.c b/libavfilter/af_adelay.c
index cfc6b1fdb5..ef60f43727 100644
--- a/libavfilter/af_adelay.c
+++ b/libavfilter/af_adelay.c
@@ -246,7 +246,7 @@ static av_cold void uninit(AVFilterContext *ctx)
     int i;
 
     for (i = 0; i < s->nb_delays; i++)
-        av_free(s->chandelay[i].samples);
+        av_freep(&s->chandelay[i].samples);
     av_freep(&s->chandelay);
 }