diff --git a/libavcodec/smacker.c b/libavcodec/smacker.c
index 8345b7f8a0..19bfab4ffd 100644
--- a/libavcodec/smacker.c
+++ b/libavcodec/smacker.c
@@ -386,7 +386,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPac
 
     buf++;
     for(i = 0; i < 256; i++)
-        *pal++ = bytestream_get_be24(&buf);
+        *pal++ = 0xFF << 24 | bytestream_get_be24(&buf);
     buf_size -= 769;
 
     last_reset(smk->mmap_tbl, smk->mmap_last);