diff --git a/app/Http/Controllers/Api/CategoriesController.php b/app/Http/Controllers/Api/CategoriesController.php
index 2aa4b3741c..a4eb192bc2 100644
--- a/app/Http/Controllers/Api/CategoriesController.php
+++ b/app/Http/Controllers/Api/CategoriesController.php
@@ -8,9 +8,9 @@ use App\Http\Transformers\CategoriesTransformer;
 use App\Http\Transformers\SelectlistTransformer;
 use App\Models\Category;
 use Illuminate\Http\Request;
+use Illuminate\Http\JsonResponse;
 use App\Http\Requests\ImageUploadRequest;
 use Illuminate\Support\Facades\Storage;
-use Illuminate\Support\Facades\Validator;
 
 class CategoriesController extends Controller
 {
@@ -21,7 +21,7 @@ class CategoriesController extends Controller
      * @since [v4.0]
      * @return \Illuminate\Http\Response
      */
-    public function index(Request $request)
+    public function index(Request $request) : array
     {
         $this->authorize('view', Category::class);
         $allowed_columns = [
@@ -115,7 +115,7 @@ class CategoriesController extends Controller
      * @param  \App\Http\Requests\ImageUploadRequest $request
      * @return \Illuminate\Http\Response
      */
-    public function store(ImageUploadRequest $request)
+    public function store(ImageUploadRequest $request) : JsonResponse
     {
         $this->authorize('create', Category::class);
         $category = new Category;
@@ -136,9 +136,8 @@ class CategoriesController extends Controller
      * @author [A. Gianotto] [<snipe@snipe.net>]
      * @since [v4.0]
      * @param  int  $id
-     * @return \Illuminate\Http\Response
      */
-    public function show($id)
+    public function show($id) : array
     {
         $this->authorize('view', Category::class);
         $category = Category::withCount('assets as assets_count', 'accessories as accessories_count', 'consumables as consumables_count', 'components as components_count', 'licenses as licenses_count')->findOrFail($id);
@@ -156,7 +155,7 @@ class CategoriesController extends Controller
      * @param  int  $id
      * @return \Illuminate\Http\Response
      */
-    public function update(ImageUploadRequest $request, $id)
+    public function update(ImageUploadRequest $request, $id) : JsonResponse
     {
         $this->authorize('update', Category::class);
         $category = Category::findOrFail($id);