diff --git a/libavutil/pixdesc.c b/libavutil/pixdesc.c
index e4ced8ebfa..4d86165da7 100644
--- a/libavutil/pixdesc.c
+++ b/libavutil/pixdesc.c
@@ -199,6 +199,7 @@ const AVPixFmtDescriptor av_pix_fmt_descriptors[PIX_FMT_NB] = {
         .comp = {
             {0,0,1,0,7},        /* Y */
         },
+        .flags = PIX_FMT_PAL,
     },
     [PIX_FMT_MONOWHITE] = {
         .name = "monow",