diff --git a/meta-arm/recipes-security/optee/optee.inc b/meta-arm/recipes-security/optee/optee.inc
index a12521dc..b3e52713 100644
--- a/meta-arm/recipes-security/optee/optee.inc
+++ b/meta-arm/recipes-security/optee/optee.inc
@@ -1,2 +1,2 @@
-COMPATIBLE_MACHINE = "null"
-# Please add supported machines below
+COMPATIBLE_MACHINE ?= "invalid"
+# Please add supported machines below or set it in .bbappend or .conf