diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index b0b5705..8378898 100644
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -33,6 +33,9 @@
 
 BOOTCFLAGS	+= -I$(obj) -I$(srctree)/$(obj)
 
+$(obj)/44x.o: BOOTCFLAGS += -Wa,-mbooke
+$(obj)/ebony.o: BOOTCFLAGS += -Wa,-mbooke
+
 zlib       := inffast.c inflate.c inftrees.c
 zlibheader := inffast.h inffixed.h inflate.h inftrees.h infutil.h
 zliblinuxheader := zlib.h zconf.h zutil.h