--- squashfs-tools/mksquashfs.c.orig	2008-09-23 14:19:02.000000000 +0200
+++ squashfs-tools/mksquashfs.c	2008-09-23 14:19:03.000000000 +0200
@@ -4160,6 +4160,9 @@
 		fragmentb_mbytes = FRAGMENT_BUFFER_DEFAULT;
 	int s_minor = SQUASHFS_MINOR;
 
+	/* set struct sBlk to zero */
+	memset(&sBlk, 0, sizeof (sBlk));
+
 	pthread_mutex_init(&progress_mutex, NULL);
 	block_log = slog(block_size);
 	if(argc > 1 && strcmp(argv[1], "-version") == 0) {