diff --git a/libavformat/utils.c b/libavformat/utils.c
index 05d4fda52c..17b342e8ad 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -852,6 +852,7 @@ static int is_intra_only(AVCodecContext *enc){
         case CODEC_ID_MJPEG:
         case CODEC_ID_MJPEGB:
         case CODEC_ID_LJPEG:
+        case CODEC_ID_PRORES:
         case CODEC_ID_RAWVIDEO:
         case CODEC_ID_DVVIDEO:
         case CODEC_ID_HUFFYUV: