diff --git a/libavcodec/aptx.c b/libavcodec/aptx.c
index e3fb064a6d..a2620a9212 100644
--- a/libavcodec/aptx.c
+++ b/libavcodec/aptx.c
@@ -989,6 +989,9 @@ static av_cold int aptx_init(AVCodecContext *avctx)
     AptXContext *s = avctx->priv_data;
     int chan, subband;
 
+    if (avctx->channels != 2)
+        return AVERROR_INVALIDDATA;
+
     s->hd = avctx->codec->id == AV_CODEC_ID_APTX_HD;
     s->block_size = s->hd ? 6 : 4;