diff --git a/libavformat/wavdec.c b/libavformat/wavdec.c
index a825c0f7c7..8abe07df61 100644
--- a/libavformat/wavdec.c
+++ b/libavformat/wavdec.c
@@ -68,7 +68,7 @@ static void set_spdif(AVFormatContext *s, WAVDemuxContext *wav)
         int ret = ffio_ensure_seekback(s->pb, len);
 
         if (ret >= 0) {
-            uint8_t *buf = av_malloc(len);
+            uint8_t *buf = av_malloc(len + AV_INPUT_BUFFER_PADDING_SIZE);
             if (!buf) {
                 ret = AVERROR(ENOMEM);
             } else {