diff --git a/libavformat/avidec.c b/libavformat/avidec.c
index b7d044fe9f..8dce8f8c45 100644
--- a/libavformat/avidec.c
+++ b/libavformat/avidec.c
@@ -641,7 +641,7 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
 
                     if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
                         st->codec->extradata_size+= 9;
-                        st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
+                        st->codec->extradata= av_realloc_f(st->codec->extradata, 1, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
                         if(st->codec->extradata)
                             memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
                     }