diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
index 421d8f77a6c0ce66aaed15296d3911bb172fabcc..5f27b3cc53787e0b8fb0f7f1a3858fac52656c0b 100644
--- a/libavcodec/vc1dec.c
+++ b/libavcodec/vc1dec.c
@@ -3191,6 +3191,8 @@ static int vc1_decode_frame(AVCodecContext *avctx,
 
             buf_size2 = vc1_unescape_buffer(buf, divider - buf, buf2);
             // TODO
+            if(!v->warn_interlaced++)
+                av_log(v->s.avctx, AV_LOG_ERROR, "Interlaced WVC1 support is not implemented\n");
             av_free(buf2);return -1;
         }else{
             buf_size2 = vc1_unescape_buffer(buf, buf_size, buf2);