diff --git a/recipes-bsp/armstubs/armstubs.bb b/recipes-bsp/armstubs/armstubs.bb
index 066f7c3..66f2833 100644
--- a/recipes-bsp/armstubs/armstubs.bb
+++ b/recipes-bsp/armstubs/armstubs.bb
@@ -17,6 +17,7 @@ export OBJCOPY8="${OBJCOPY}"
 export OBJDUMP8="${OBJDUMP} -maarch64"
 
 do_compile() {
+    [ -z "${ARMSTUB}" ] && bbfatal "No ARMSTUB defined for your machine."
     oe_runmake ${ARMSTUB}
 }