diff --git a/tools/objtool/Makefile b/tools/objtool/Makefile
index 1f75b0a046ccad81bd78da1189e5039f7c40fd37..988129cb77269da8655e70f21eb79f7e275e76d7 100644
--- a/tools/objtool/Makefile
+++ b/tools/objtool/Makefile
@@ -1,11 +1,9 @@
 include ../scripts/Makefile.include
+include ../scripts/Makefile.arch
 
-ifndef ($(ARCH))
-ARCH ?= $(shell uname -m)
 ifeq ($(ARCH),x86_64)
 ARCH := x86
 endif
-endif
 
 # always use the host compiler
 CC = gcc