--- squashfs-tools/mksquashfs.c
+++ squashfs-tools/mksquashfs.c
@@ -4461,6 +4461,9 @@
 			sBlk->lookup_table_start);
 
 	sBlk->bytes_used = bytes;
+#if (TARGET_FORMAT == AVM_BE || TARGET_FORMAT == AVM_LE)
+	sBlk->mkfs_time = (int) sBlk->bytes_used;
+#endif
 
 	sBlk->compression = comp->id;
 
--- squashfs-tools/unsquashfs.c
+++ squashfs-tools/unsquashfs.c
@@ -1626,8 +1626,21 @@
 
 void squashfs_stat(char *source)
 {
-	time_t mkfs_time = (time_t) sBlk.s.mkfs_time;
-	char *mkfs_str = ctime(&mkfs_time);
+	char *mkfs_str = NULL;
+	int do_interpret_mkfs_time_as_time = 1;
+
+#if (TARGET_FORMAT == AVM_BE || TARGET_FORMAT == AVM_LE)
+	if (sBlk.s.s_major == 4 && sBlk.s.mkfs_time == (int)sBlk.s.bytes_used) {
+		do_interpret_mkfs_time_as_time = 0;
+		mkfs_str = "is not available because of modified AVM-format (mkfs_time == bytes_used)\n";
+	}
+#endif
+
+	if (do_interpret_mkfs_time_as_time) {
+		time_t mkfs_time = (time_t) sBlk.s.mkfs_time;
+		mkfs_str = ctime(&mkfs_time);
+	}
+
 
 	printf("Found a valid %sSQUASHFS %d:%d superblock on %s.\n",
 #if __BYTE_ORDER == __BIG_ENDIAN