USE_ATKBD = generic kvm_guest
-ifneq ($(foreach subtarget,$(USE_ATKBD),$(CONFIG_TARGET_x86_$(subtarget))),)
+ifneq ($(strip $(foreach subtarget,$(USE_ATKBD),$(CONFIG_TARGET_x86_$(subtarget)))),)
GRUB2_MODULES += at_keyboard
GRUB2_MODULES_ISO += at_keyboard
endif