diff --git a/nixos/modules/programs/tsm-client.nix b/nixos/modules/programs/tsm-client.nix
index 039eab1af553..39b69054de5d 100644
--- a/nixos/modules/programs/tsm-client.nix
+++ b/nixos/modules/programs/tsm-client.nix
@@ -168,7 +168,7 @@ let
       client system-options file "dsm.sys"
     '');
     servers = mkOption {
-      type = attrsOf (submodule [ serverOptions ]);
+      type = attrsOf (submodule serverOptions);
       default = {};
       example.mainTsmServer = {
         server = "tsmserver.company.com";