diff --git a/libavcodec/mjpegenc.c b/libavcodec/mjpegenc.c
index a39b990eea..58b0f2bb37 100644
--- a/libavcodec/mjpegenc.c
+++ b/libavcodec/mjpegenc.c
@@ -297,8 +297,6 @@ av_cold int ff_mjpeg_encode_init(MpegEncContext *s)
 
     s->mjpeg_ctx = m;
 
-    av_assert0(s->slice_context_count == 1);
-
     if (s->codec_id == AV_CODEC_ID_AMV || (s->avctx->active_thread_type & FF_THREAD_SLICE))
         m->huffman = HUFFMAN_TABLE_DEFAULT;
 
diff --git a/libavcodec/speedhqenc.c b/libavcodec/speedhqenc.c
index 22213b823d..8dbb976248 100644
--- a/libavcodec/speedhqenc.c
+++ b/libavcodec/speedhqenc.c
@@ -90,8 +90,6 @@ av_cold int ff_speedhq_encode_init(MpegEncContext *s)
 {
     static AVOnce init_static_once = AV_ONCE_INIT;
 
-    av_assert0(s->slice_context_count == 1);
-
     if (s->width > 65500 || s->height > 65500) {
         av_log(s, AV_LOG_ERROR, "SpeedHQ does not support resolutions above 65500x65500\n");
         return AVERROR(EINVAL);