diff --git a/app/controllers/accounts_controller.rb b/app/controllers/accounts_controller.rb
index 66473869beeeb6..dd25db5d4f81ee 100644
--- a/app/controllers/accounts_controller.rb
+++ b/app/controllers/accounts_controller.rb
@@ -8,6 +8,7 @@ class AccountsController < ApplicationController
   include Pawoo::AccountsControllerConcern
   include SignatureAuthentication
 
+  before_action :require_signature!, if: -> { request.format == :json && authorized_fetch_mode? }
   before_action :set_cache_headers
   before_action :set_body_classes
 
@@ -50,7 +51,7 @@ def show
 
       format.json do
         expires_in 3.minutes, public: !(authorized_fetch_mode? && signed_request_account.present?)
-        render_with_cache json: @account, content_type: 'application/activity+json', serializer: ActivityPub::ActorSerializer, adapter: ActivityPub::Adapter, fields: restrict_fields_to
+        render_with_cache json: @account, content_type: 'application/activity+json', serializer: ActivityPub::ActorSerializer, adapter: ActivityPub::Adapter
       end
     end
   end
@@ -152,12 +153,4 @@ def filtered_status_page
   def params_slice(*keys)
     params.slice(*keys).permit(*keys)
   end
-
-  def restrict_fields_to
-    if signed_request_account.present? || public_fetch_mode?
-      # Return all fields
-    else
-      %i(id type preferred_username inbox public_key endpoints)
-    end
-  end
 end
diff --git a/spec/controllers/accounts_controller_spec.rb b/spec/controllers/accounts_controller_spec.rb
index 93bf2c83f4076b..b04f4650bc407f 100644
--- a/spec/controllers/accounts_controller_spec.rb
+++ b/spec/controllers/accounts_controller_spec.rb
@@ -348,24 +348,8 @@
         context 'in authorized fetch mode' do
           let(:authorized_fetch_mode) { true }
 
-          it 'returns http success' do
-            expect(response).to have_http_status(200)
-          end
-
-          it 'returns application/activity+json' do
-            expect(response.content_type).to eq 'application/activity+json'
-          end
-
-          it_behaves_like 'cachable response'
-
-          it 'returns Vary header with Signature' do
-            expect(response.headers['Vary']).to include 'Signature'
-          end
-
-          it 'renders bare minimum account' do
-            json = body_as_json
-            expect(json).to include(:id, :type, :preferredUsername, :inbox, :publicKey)
-            expect(json).to_not include(:name, :summary)
+          it 'returns http unauthorized' do
+            expect(response).to have_http_status(401)
           end
         end
       end