diff --git a/meta-ti-bsp/conf/machine/include/k3.inc b/meta-ti-bsp/conf/machine/include/k3.inc
index a296f64fa141..07f0bcb48bfc 100644
--- a/meta-ti-bsp/conf/machine/include/k3.inc
+++ b/meta-ti-bsp/conf/machine/include/k3.inc
@@ -26,10 +26,11 @@ UBOOT_SUFFIX = "img"
 
 UBOOT_SIGN_ENABLE = "1"
 UBOOT_MKIMAGE_DTCOPTS = "-I dts -O dtb"
-UBOOT_SIGN_KEYNAME ?= "custMpk"
-UBOOT_SIGN_KEYDIR ?= "${TI_SECURE_DEV_PKG}/keys"
-FIT_HASH_ALG ?= "sha512"
-FIT_SIGN_ALG ?= "rsa4096"
+UBOOT_SIGN_KEYNAME ??= "custMpk"
+UBOOT_SIGN_KEYDIR ??= "${TI_SECURE_DEV_PKG}/keys"
+FIT_HASH_ALG ??= "sha512"
+FIT_SIGN_ALG ??= "rsa4096"
+FIT_SIGN_NUMBITS ??= "4096"
 
 EXTRA_IMAGEDEPENDS += "virtual/bootloader"