diff --git a/ci/uefi-secureboot.yml b/ci/uefi-secureboot.yml
index 4cc4e658b5e0..f16e8686be51 100644
--- a/ci/uefi-secureboot.yml
+++ b/ci/uefi-secureboot.yml
@@ -39,7 +39,6 @@ local_conf_header:
     IMAGE_CLASSES += "sbsign"
     UKI_SB_KEY = "${SBSIGN_KEY}"
     UKI_SB_CERT = "${SBSIGN_CERT}"
-    QB_KERNEL_ROOT = ""
     IMAGE_BOOT_FILES:remove = "Image"
 
     INITRAMFS_IMAGE = "core-image-initramfs-boot"