diff --git a/libavfilter/af_extrastereo.c b/libavfilter/af_extrastereo.c
index b4f8c85c38..020d09c025 100644
--- a/libavfilter/af_extrastereo.c
+++ b/libavfilter/af_extrastereo.c
@@ -71,7 +71,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
     if (av_frame_is_writable(in)) {
         out = in;
     } else {
-        AVFrame *out = ff_get_audio_buffer(inlink, in->nb_samples);
+        out = ff_get_audio_buffer(inlink, in->nb_samples);
         if (!out) {
             av_frame_free(&in);
             return AVERROR(ENOMEM);