diff --git a/sys/dev/disk/xdisk/xdisk.c b/sys/dev/disk/xdisk/xdisk.c
--- a/sys/dev/disk/xdisk/xdisk.c
+++ b/sys/dev/disk/xdisk/xdisk.c
@@ -598,7 +598,7 @@
 		 * part of a streaming transaction), we will have
 		 * already closed our end.
 		 */
-		if (msg->aux_data) {
+		if (msg->aux_data && xa_debug > 1) {
 			msg->aux_data[msg->aux_size - 1] = 0;
 			xa_printf(0, "DEBUGMSG: %s\n", msg->aux_data);
 		}