diff --git a/libavcodec/h264.c b/libavcodec/h264.c
index d5f4760b0c..3dcf00a357 100644
--- a/libavcodec/h264.c
+++ b/libavcodec/h264.c
@@ -1224,6 +1224,7 @@ static int decode_update_thread_context(AVCodecContext *dst,
         /* copy block_offset since frame_start may not be called */
         memcpy(h->block_offset, h1->block_offset, sizeof(h->block_offset));
         h264_set_parameter_from_sps(h);
+        h->cur_chroma_format_idc = h1->cur_chroma_format_idc;
     }
 
     err = ff_mpeg_update_thread_context(dst, src);