diff --git a/libavcodec/mdec.c b/libavcodec/mdec.c
index 1567e14a1f..d9bb64e31f 100644
--- a/libavcodec/mdec.c
+++ b/libavcodec/mdec.c
@@ -215,6 +215,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
     if (avctx->idct_algo == FF_IDCT_AUTO)
         avctx->idct_algo = FF_IDCT_SIMPLE;
     avctx->pix_fmt  = AV_PIX_FMT_YUVJ420P;
+    avctx->color_range = AVCOL_RANGE_JPEG;
 
     return 0;
 }