diff --git a/libavcodec/mpegvideo.h b/libavcodec/mpegvideo.h
index cadf6f2450..266e971f8c 100644
--- a/libavcodec/mpegvideo.h
+++ b/libavcodec/mpegvideo.h
@@ -788,7 +788,6 @@ int ff_mpv_export_qp_table(MpegEncContext *s, AVFrame *f, Picture *p, int qp_typ
 
 void ff_write_quant_matrix(PutBitContext *pb, uint16_t *matrix);
 int ff_find_unused_picture(MpegEncContext *s, int shared);
-void ff_denoise_dct(MpegEncContext *s, int16_t *block);
 int ff_update_duplicate_context(MpegEncContext *dst, MpegEncContext *src);
 int ff_mpeg_update_thread_context(AVCodecContext *dst, const AVCodecContext *src);
 void ff_set_qscale(MpegEncContext * s, int qscale);