diff --git a/libavcodec/shorten.c b/libavcodec/shorten.c
index 1dc010f441..50fc506440 100644
--- a/libavcodec/shorten.c
+++ b/libavcodec/shorten.c
@@ -345,6 +345,7 @@ static int read_header(ShortenContext *s)
     s->channels = get_uint(s, CHANSIZE);
     if (s->channels <= 0 || s->channels > MAX_CHANNELS) {
         av_log(s->avctx, AV_LOG_ERROR, "too many channels: %d\n", s->channels);
+        s->channels = 0;
         return -1;
     }
     s->avctx->channels = s->channels;