diff --git a/ffmpeg.c b/ffmpeg.c
index 2ee0011180..3f12c1f089 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -1049,7 +1049,7 @@ static int output_packet(AVInputStream *ist, int ist_index,
             switch(ist->st->codec->codec_type) {
             case CODEC_TYPE_AUDIO:{
                 if(pkt)
-                    samples= av_fast_realloc(samples, &samples_size, FFMAX(pkt->size, AVCODEC_MAX_AUDIO_FRAME_SIZE));
+                    samples= av_fast_realloc(samples, &samples_size, FFMAX(pkt->size*sizeof(*samples), AVCODEC_MAX_AUDIO_FRAME_SIZE));
                 data_size= samples_size;
                     /* XXX: could avoid copy if PCM 16 bits with same
                        endianness as CPU */