diff --git a/libavcodec/ffv1.c b/libavcodec/ffv1.c
index 46293524fb..753e961428 100644
--- a/libavcodec/ffv1.c
+++ b/libavcodec/ffv1.c
@@ -467,7 +467,7 @@ static av_always_inline int encode_line(FFV1Context *s, int w,
     int run_mode=0;
 
     if(s->ac){
-        if(c->bytestream_end - c->bytestream < w*20){
+        if(c->bytestream_end - c->bytestream < w*35){
             av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
             return -1;
         }