diff --git a/libavcodec/mpeg12.c b/libavcodec/mpeg12.c
index 4cbfa8d636..059083277a 100644
--- a/libavcodec/mpeg12.c
+++ b/libavcodec/mpeg12.c
@@ -2539,7 +2539,7 @@ AVCodec ff_mpeg1video_decoder = {
     NULL,
     mpeg_decode_end,
     mpeg_decode_frame,
-    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
+    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
     .flush= flush,
     .max_lowres= 3,
     .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),