diff --git a/conf/machine/am335x-evm.conf b/conf/machine/am335x-evm.conf
index 92e6cf05..8bfbee84 100644
--- a/conf/machine/am335x-evm.conf
+++ b/conf/machine/am335x-evm.conf
@@ -24,7 +24,7 @@ SERIAL_CONSOLES_CHECK = "${SERIAL_CONSOLES}"
 # UBI: logical eraseblock size:    126976 bytes
 # from ubiattach stdout:
 # UBI device number 0, total 1988 LEBs
-MKUBIFS_ARGS = "-F -m 2048 -e 126976 -c 9900"
+MKUBIFS_ARGS ?= "-F -m 2048 -e 126976 -c 9900"
 
 # do ubiattach /dev/ubi_ctrl -m 7 -O 2048
 # from dmesg:
@@ -32,4 +32,4 @@ MKUBIFS_ARGS = "-F -m 2048 -e 126976 -c 9900"
 # UBI: physical eraseblock size:   131072 bytes (128 KiB)
 # UBI: sub-page size:              512
 # UBI: VID header offset:          2048 (aligned 2048)
-UBINIZE_ARGS = "-m 2048 -p 128KiB -s 512 -O 2048"
+UBINIZE_ARGS ?= "-m 2048 -p 128KiB -s 512 -O 2048"