diff --git a/lib.nix b/lib.nix
index 64c35c1..89098cb 100644
--- a/lib.nix
+++ b/lib.nix
@@ -37,8 +37,11 @@ let
     attrs@{ staticModules ? [ ] }: mkOptionType {
       name = "deferredModule";
       description = "module";
+      descriptionClass = "noun";
       check = x: isAttrs x || isFunction x || path.check x;
-      merge = loc: defs: staticModules ++ map (def: lib.setDefaultModuleLocation "${def.file}, via option ${showOption loc}" def.value) defs;
+      merge = loc: defs: {
+        imports = staticModules ++ map (def: lib.setDefaultModuleLocation "${def.file}, via option ${showOption loc}" def.value) defs;
+      };
       inherit (submoduleWith { modules = staticModules; })
         getSubOptions
         getSubModules;
diff --git a/modules/perSystem.nix b/modules/perSystem.nix
index 499858a..4b20e55 100644
--- a/modules/perSystem.nix
+++ b/modules/perSystem.nix
@@ -119,9 +119,9 @@ in
           _module.args.moduleWithSystem = throwAliasError "moduleWithSystem";
         };
       });
-      apply = modules: system:
+      apply = module: system:
         (lib.evalModules {
-          inherit modules;
+          modules = [ module ];
           prefix = [ "perSystem" system ];
           specialArgs = {
             inherit system;