diff --git a/sendmail.spec b/sendmail.spec
index 01b086c..640b4da 100644
--- a/sendmail.spec
+++ b/sendmail.spec
@@ -264,7 +264,7 @@ Make() {
 		MSPQOWN=${nameuser}
 }
 
-OBJDIR=obj.$(uname -s).$(uname -r).%{_arch}
+OBJDIR=obj.$(uname -s).$(uname -r).$(uname -m)
 
 Make install -C $OBJDIR/libmilter
 Make install -C $OBJDIR/libsmutil