diff --git a/meta-arm/recipes-security/optee/optee-os_git.bb b/meta-arm/recipes-security/optee/optee-os_git.bb
index 5c420b70..dfff6d10 100644
--- a/meta-arm/recipes-security/optee/optee-os_git.bb
+++ b/meta-arm/recipes-security/optee/optee-os_git.bb
@@ -23,6 +23,7 @@ S = "${WORKDIR}/git"
 OPTEEMACHINE ?= "${MACHINE}"
 OPTEEOUTPUTMACHINE ?= "${MACHINE}"
 
+OPTEE_ARCH = "null"
 OPTEE_ARCH_armv7a = "arm32"
 OPTEE_ARCH_aarch64 = "arm64"
 OPTEE_CORE = "${@d.getVar('OPTEE_ARCH').upper()}"