diff --git a/Makefile.inc b/Makefile.inc
index 2544efd108..2d3ae2bc51 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -159,7 +159,7 @@ endef
 define ramstage-objs_asl_template
 $$(call src-to-obj,ramstage,$(1).asl): $(1).asl $(obj)/config.h
 	@printf "    IASL       $$(subst $(top)/,,$$(@))\n"
-	$(CC_ramstage) -x assembler-with-cpp -E -MMD -MT $$(@) -D__ACPI__ -P -include $(src)/include/kconfig.h -I$(obj) -I$(src) -I$(src)/include -I$(src)/arch/$(ARCHDIR-$(ARCH-ramstage-y))/include -I$(src)/mainboard/$(MAINBOARDDIR) $$< -o $$@
+	$(CC_ramstage) -x assembler-with-cpp -E -MMD -MT $$(@) $$(CPPFLAGS_ramstage) -D__ACPI__ -P -include $(src)/include/kconfig.h -I$(obj) -I$(src) -I$(src)/include -I$(src)/arch/$(ARCHDIR-$(ARCH-ramstage-y))/include -I$(src)/mainboard/$(MAINBOARDDIR) $$< -o $$@
 	cd $$(dir $$@); $(IASL) -p $$(notdir $$@) -tc $$(notdir $$@)
 	mv $$(basename $$@).hex $$(basename $$@).c
 	$(CC_ramstage) $$(CFLAGS_ramstage) $$(CPPFLAGS_ramstage) $$(if $$(subst dsdt,,$$(basename $$(notdir $(1)))), -DAmlCode=AmlCode_$$(basename $$(notdir $(1)))) -c -o $$@ $$(basename $$@).c