diff --git a/libavformat/nullenc.c b/libavformat/nullenc.c
index 79fc02e528..680b29c828 100644
--- a/libavformat/nullenc.c
+++ b/libavformat/nullenc.c
@@ -32,5 +32,5 @@ AVOutputFormat ff_null_muxer = {
     .audio_codec       = AV_NE(CODEC_ID_PCM_S16BE, CODEC_ID_PCM_S16LE),
     .video_codec       = CODEC_ID_RAWVIDEO,
     .write_packet      = null_write_packet,
-    .flags = AVFMT_NOFILE | AVFMT_RAWPICTURE | AVFMT_NOTIMESTAMPS,
+    .flags = AVFMT_NOFILE | AVFMT_NOTIMESTAMPS,
 };