diff --git a/libavcodec/mpeg12dec.c b/libavcodec/mpeg12dec.c
index 92772acf5f..64f39ea995 100644
--- a/libavcodec/mpeg12dec.c
+++ b/libavcodec/mpeg12dec.c
@@ -2641,7 +2641,7 @@ static int mpeg_decode_frame(AVCodecContext *avctx, AVFrame *picture,
     return ret;
 }
 
-static void flush(AVCodecContext *avctx)
+static av_cold void flush(AVCodecContext *avctx)
 {
     Mpeg1Context *s = avctx->priv_data;