diff --git a/conf/machine/sysmobts-v2.conf b/conf/machine/sysmobts-v2.conf
index 1bfe7cc..b86a9a1 100644
--- a/conf/machine/sysmobts-v2.conf
+++ b/conf/machine/sysmobts-v2.conf
@@ -7,8 +7,8 @@ EXTRA_IMAGEDEPENDS = "dvnixload-native ubl u-boot sysmobts-firmware"
 EXTRA_IMAGECMD_jffs2 = "--little-endian --eraseblock=0x20000 --pagesize=0x800 --no-cleanmarkers --pad=0x2000000 -n"
 
 # ubifs config
-MKUBIFS_ARGS = "-m 2048 -e 129024 -c 400"
-UBINIZE_ARGS = "-m 2048 -p 128KiB -s 512"
+MKUBIFS_ARGS ?= "-m 2048 -e 129024 -c 400"
+UBINIZE_ARGS ?= "-m 2048 -p 128KiB -s 512"
 
 
 require conf/machine/include/sysmobts.inc