diff --git a/archiso/mkarchiso b/archiso/mkarchiso
index 567a5af..36d7e3b 100755
--- a/archiso/mkarchiso
+++ b/archiso/mkarchiso
@@ -5,7 +5,7 @@ set -e -u
 export LANG=C
 
 app_name=${0##*/}
-arch=$(uname -m)
+arch=${arch:-$(uname -m)}
 pkg_list=""
 run_cmd=""
 quiet="y"