diff --git a/post/cpu/mpc8xx/Makefile b/post/cpu/mpc8xx/Makefile
index efde1fb..7a2930a 100644
--- a/post/cpu/mpc8xx/Makefile
+++ b/post/cpu/mpc8xx/Makefile
@@ -4,11 +4,8 @@
 #
 # SPDX-License-Identifier:	GPL-2.0+
 #
-include $(OBJTREE)/include/autoconf.mk
 
-LIB	= libpostmpc8xx.o
-
-AOBJS-$(CONFIG_HAS_POST)	+= cache_8xx.o
-COBJS-$(CONFIG_HAS_POST)	+= cache.o ether.o spr.o uart.o usb.o watchdog.o
+CPPFLAGS += -I$(TOPDIR)
 
-include $(TOPDIR)/post/rules.mk
+obj-$(CONFIG_HAS_POST)	+= cache_8xx.o
+obj-$(CONFIG_HAS_POST)	+= cache.o ether.o spr.o uart.o usb.o watchdog.o