diff --git a/meta-arm/conf/machine/qemuarm64-secureboot.conf b/meta-arm/conf/machine/qemuarm64-secureboot.conf
index 78a39c03..10216631 100644
--- a/meta-arm/conf/machine/qemuarm64-secureboot.conf
+++ b/meta-arm/conf/machine/qemuarm64-secureboot.conf
@@ -18,7 +18,7 @@ QB_KERNEL_ROOT = "/dev/vda2"
 IMAGE_FSTYPES += "wic wic.qcow2"
 
 WKS_FILE ?= "qemuarm64.wks"
-WKS_FILE_DEPENDS = "trusted-firmware-a"
+WKS_FILE_DEPENDS:append = " trusted-firmware-a"
 IMAGE_BOOT_FILES = "${KERNEL_IMAGETYPE}"
 
 MACHINE_FEATURES += "optee-ftpm"