diff --git a/default.nix b/default.nix
index 281502f..8132bfe 100644
--- a/default.nix
+++ b/default.nix
@@ -1,5 +1,5 @@
 {
-  device ? (import devices/gl-ar750.nix)
+  device
 , liminix-config ? <liminix-config>
 , phram ? false
 }:
diff --git a/tests/smoke/test.nix b/tests/smoke/test.nix
new file mode 100644
index 0000000..ed1c57d
--- /dev/null
+++ b/tests/smoke/test.nix
@@ -0,0 +1,29 @@
+{
+  liminix
+, nixpkgs
+}:
+let img = (import liminix {
+      device = import "${liminix}/devices/qemu/";
+      liminix-config = ./configuration.nix;
+    }).outputs.squashfs;
+    pkgs = import <nixpkgs> {};
+    check = pkgs.runCommand "check" {
+      nativeBuildInputs = with pkgs; [ squashfsTools s6-rc ] ;
+    } ''
+destpath=$(mktemp -d)/smoke.img
+echo $destpath
+cleanup(){  test -n $destpath && test -d $destpath && chmod -R +w $destpath && rm -rf $destpath;  }
+trap cleanup EXIT
+trap 'echo "command $(eval echo $BASH_COMMAND) failed with exit code $?"; exit $?' ERR
+unsquashfs -q -d $destpath -excludes ${img}  /dev
+cd $destpath;
+db=nix/store/*-s6-rc-database/compiled/
+test -d $db
+chmod -R +w $db
+# check we have closure of config.services (lo.link service exists only
+# as a dependency)
+test "$(s6-rc-db -c $db type lo.link)" = "oneshot"
+test "$(s6-rc-db -c $db type ntp)" = "longrun"
+echo OK > $out
+'';
+in { inherit check; }