diff --git a/libavcodec/aac_adtstoasc_bsf.c b/libavcodec/aac_adtstoasc_bsf.c
index 96876dd62f446af1a48affda1ecb2745dd0b64d6..9d53a011c8b51d08ade6c04005d88a768d3f3130 100644
--- a/libavcodec/aac_adtstoasc_bsf.c
+++ b/libavcodec/aac_adtstoasc_bsf.c
@@ -84,7 +84,7 @@ static int aac_adtstoasc_filter(AVBitStreamFilterContext *bsfc,
             buf      += get_bits_count(&gb)/8;
         }
         avctx->extradata_size = 2 + pce_size;
-        avctx->extradata = av_malloc(avctx->extradata_size);
+        avctx->extradata = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 
         init_put_bits(&pb, avctx->extradata, avctx->extradata_size);
         put_bits(&pb, 5, hdr.object_type);