diff --git a/libavcodec/mpeg12enc.c b/libavcodec/mpeg12enc.c
index 01dd8f04cc..5dc7652d12 100644
--- a/libavcodec/mpeg12enc.c
+++ b/libavcodec/mpeg12enc.c
@@ -974,7 +974,7 @@ AVCodec ff_mpeg1video_encoder = {
     .close          = MPV_encode_end,
     .supported_framerates= avpriv_frame_rate_tab+1,
     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
-    .capabilities= CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
+    .capabilities= CODEC_CAP_DELAY,
     .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
     .priv_class     = &mpeg1_class,
 };