diff --git a/libavformat/rmdec.c b/libavformat/rmdec.c
index 4cc4a34df0..79623094d6 100644
--- a/libavformat/rmdec.c
+++ b/libavformat/rmdec.c
@@ -494,7 +494,8 @@ static int rm_assemble_video_frame(AVFormatContext *s, RMContext *rm, AVPacket *
     if((seq & 0x7F) == 1 || rm->curpic_num != pic_num){
         rm->slices = ((hdr & 0x3F) << 1) + 1;
         rm->videobufsize = len2 + 8*rm->slices + 1;
-        if(!(rm->videobuf = av_realloc(rm->videobuf, rm->videobufsize)))
+        av_free(rm->videobuf);
+        if(!(rm->videobuf = av_malloc(rm->videobufsize)))
             return AVERROR(ENOMEM);
         rm->videobufpos = 8*rm->slices + 1;
         rm->cur_slice = 0;