diff --git a/target/linux/bcm53xx/base-files/etc/uci-defaults/09_fix_crc b/target/linux/bcm53xx/base-files/etc/uci-defaults/09_fix_crc
index 8cb8a90ce9..7056017107 100644
--- a/target/linux/bcm53xx/base-files/etc/uci-defaults/09_fix_crc
+++ b/target/linux/bcm53xx/base-files/etc/uci-defaults/09_fix_crc
@@ -1,8 +1,7 @@
 #!/bin/sh
 
 kernel_size=$(sed -n 's/mtd[0-9]*: \([0-9a-f]*\).*"\(kernel\|linux\)".*/\1/p' /proc/mtd)
-[ -n "$kernel_size" ] && kernel_size=$((0x$kernel_size))
 
-mtd ${kernel_size:+-c $kernel_size} fixtrx firmware && exit 0
+mtd ${kernel_size:+-c 0x$kernel_size} fixtrx firmware && exit 0
 mtd fixseama firmware && exit 0
 exit 1