diff --git a/libavcodec/j2kenc.c b/libavcodec/j2kenc.c
index 1931def765..df55c9c62e 100644
--- a/libavcodec/j2kenc.c
+++ b/libavcodec/j2kenc.c
@@ -1003,6 +1003,7 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
     int tileno, ret;
     Jpeg2000EncoderContext *s = avctx->priv_data;
     uint8_t *chunkstart, *jp2cstart, *jp2hstart;
+    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt);
 
     if ((ret = ff_alloc_packet2(avctx, pkt, avctx->width*avctx->height*9 + AV_INPUT_BUFFER_MIN_SIZE, 0)) < 0)
         return ret;
@@ -1055,7 +1056,7 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
         bytestream_put_byte(&s->buf, 1);
         bytestream_put_byte(&s->buf, 0);
         bytestream_put_byte(&s->buf, 0);
-        if (avctx->pix_fmt == AV_PIX_FMT_RGB24 || avctx->pix_fmt == AV_PIX_FMT_PAL8) {
+        if ((desc->flags & AV_PIX_FMT_FLAG_RGB) || avctx->pix_fmt == AV_PIX_FMT_PAL8) {
             bytestream_put_be32(&s->buf, 16);
         } else if (s->ncomponents == 1) {
             bytestream_put_be32(&s->buf, 17);