diff --git a/modules/later/nextcloud.nix b/modules/later/nextcloud.nix
index 0c6bff2..b47e001 100644
--- a/modules/later/nextcloud.nix
+++ b/modules/later/nextcloud.nix
@@ -1,5 +1,7 @@
 { config, lib, pkgs, ... }:
 
+assert lib.versionOlder lib.version "20.09";
+
 with lib;
 
 let
diff --git a/modules/later/syncthing.nix b/modules/later/syncthing.nix
index ea7401f..aaa8a94 100644
--- a/modules/later/syncthing.nix
+++ b/modules/later/syncthing.nix
@@ -1,5 +1,7 @@
 { config, lib, pkgs, ... }:
 
+assert lib.versionOlder lib.version "20.09";
+
 with lib;
 
 let
@@ -63,6 +65,7 @@ let
       ${cfg.guiAddress}/rest/system/restart
   '';
 in {
+
   ###### interface
   options = {
     test.services.syncthing = {