diff --git a/config b/config
index dfc220a..4c670eb 100644
--- a/config
+++ b/config
@@ -28,8 +28,8 @@ version="1.0.0-beta"
 mirror="http://auto.mirror.devuan.org/merged"
 section="main"
 
-image_name="$os_$release_$version_$arch"
-[[ -n $device_name ]] && image_name+="_${device_name}"
+image_name="${os}_${release}_${version}_${arch}"
+[[ -n $device_name ]] && image_name="${image_name}_${device_name}"
 
 core_packages=(
 	devuan-keyring