diff --git a/libavcodec/cdxl.c b/libavcodec/cdxl.c
index 3c2afd0232..1af69b75b4 100644
--- a/libavcodec/cdxl.c
+++ b/libavcodec/cdxl.c
@@ -119,6 +119,7 @@ static void cdxl_decode_rgb(CDXLVideoContext *c)
 {
     uint32_t *new_palette = (uint32_t *)c->frame.data[1];
 
+    memset(c->frame.data[1], 0, AVPALETTE_SIZE);
     import_palette(c, new_palette);
     import_format(c, c->frame.linesize[0], c->frame.data[0]);
 }