diff --git a/libavfilter/af_amix.c b/libavfilter/af_amix.c
index 3e5e7ee118..0e32c8affb 100644
--- a/libavfilter/af_amix.c
+++ b/libavfilter/af_amix.c
@@ -235,7 +235,7 @@ static int config_output(AVFilterLink *outlink)
     if (!s->fifos)
         return AVERROR(ENOMEM);
 
-    s->nb_channels = av_get_channel_layout_nb_channels(outlink->channel_layout);
+    s->nb_channels = outlink->channels;
     for (i = 0; i < s->nb_inputs; i++) {
         s->fifos[i] = av_audio_fifo_alloc(outlink->format, s->nb_channels, 1024);
         if (!s->fifos[i])