diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index dc2d18e93002723538375df5e50d50f098ca5b2d..643839a3f5d82d484bd77b651711b93781a36c1b 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -35,7 +35,11 @@ endif
 
 export CROSS32CC CROSS32AS CROSS32LD CROSS32AR CROSS32OBJCOPY
 
+ifeq ($(CROSS_COMPILE),)
 KBUILD_DEFCONFIG := $(shell uname -m)_defconfig
+else
+KBUILD_DEFCONFIG := ppc64_defconfig
+endif
 
 ifeq ($(CONFIG_PPC64),y)
 OLDARCH	:= ppc64