diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c
index c812b86e87..c730e05d54 100644
--- a/libavcodec/mjpegdec.c
+++ b/libavcodec/mjpegdec.c
@@ -632,7 +632,8 @@ unk_pixfmt:
         av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
     }
 
-    if (s->rgb && !s->lossless && !s->ls) {
+    if ((s->rgb && !s->lossless && !s->ls) ||
+        (!s->rgb && s->ls && s->nb_components > 1)) {
         av_log(s->avctx, AV_LOG_ERROR, "Unsupported coding and pixel format combination\n");
         return AVERROR_PATCHWELCOME;
     }