diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
index ca27ee8..d239cf8 100644
--- a/drivers/cdrom/cdrom.c
+++ b/drivers/cdrom/cdrom.c
@@ -1837,7 +1837,7 @@
 	init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
 	cgc.cmd[0] = GPCMD_READ_DVD_STRUCTURE;
 	cgc.cmd[7] = s->type;
-	cgc.cmd[9] = cgc.buflen = 0xff;
+	cgc.cmd[9] = cgc.buflen & 0xff;
 
 	if ((ret = cdo->generic_packet(cdi, &cgc)))
 		return ret;