diff --git a/openwrt/target/linux/brcm-2.4/patches/004-flash.patch b/openwrt/target/linux/brcm-2.4/patches/004-flash.patch
index 7a070128ed..14ba3b15f4 100644
--- a/openwrt/target/linux/brcm-2.4/patches/004-flash.patch
+++ b/openwrt/target/linux/brcm-2.4/patches/004-flash.patch
@@ -334,7 +334,7 @@ diff -urN linux.old/drivers/mtd/devices/sflash.c linux.dev/drivers/mtd/devices/s
 diff -urN linux.old/drivers/mtd/maps/bcm947xx-flash.c linux.dev/drivers/mtd/maps/bcm947xx-flash.c
 --- linux.old/drivers/mtd/maps/bcm947xx-flash.c	1970-01-01 01:00:00.000000000 +0100
 +++ linux.dev/drivers/mtd/maps/bcm947xx-flash.c	2006-06-23 18:08:46.000000000 +0200
-@@ -0,0 +1,545 @@
+@@ -0,0 +1,547 @@
 +/*
 + *  Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
 + *  Copyright (C) 2005 Waldemar Brodkorb <wbx@openwrt.org>
@@ -664,8 +664,10 @@ diff -urN linux.old/drivers/mtd/maps/bcm947xx-flash.c linux.dev/drivers/mtd/maps
 +
 +		/* Update the squashfs partition size based on the superblock info */
 +		part->size = sb->bytes_used;
-+		part->size +=  (mtd->erasesize - 1);
-+		part->size &= ~(mtd->erasesize - 1);
++		len = part->offset + part->size;
++		len +=  (mtd->erasesize - 1);
++		len &= ~(mtd->erasesize - 1);
++		part->size = len - part->offset;
 +	} else if (*((__u16 *) buf) == JFFS2_MAGIC_BITMASK) {
 +		printk(KERN_INFO "%s: Filesystem type: jffs2\n", mtd->name);
 +