diff --git a/libavcodec/libvo-amrwbenc.c b/libavcodec/libvo-amrwbenc.c
index 9c7c91b617..4beede0863 100644
--- a/libavcodec/libvo-amrwbenc.c
+++ b/libavcodec/libvo-amrwbenc.c
@@ -87,7 +87,7 @@ static av_cold int amr_wb_encode_init(AVCodecContext *avctx)
         return AVERROR(ENOSYS);
     }
 
-    if (avctx->channels != 1) {
+    if (avctx->ch_layout.nb_channels != 1) {
         av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
         return AVERROR(ENOSYS);
     }