diff --git a/app/controllers/admin/box_controller.rb b/app/controllers/admin/box_controller.rb
index 2043397..d1c2884 100644
--- a/app/controllers/admin/box_controller.rb
+++ b/app/controllers/admin/box_controller.rb
@@ -28,7 +28,7 @@ class Admin::BoxController < ApplicationController
 private
   def check_login
     user = current_user
-    if user.nil? || user.is_admin?
+    if user.nil? || !user.is_admin?
       return render :file => "#{Rails.root}/app/views/errors/404.html", :layout => false, :status => :not_found, :formats => [:html] 
     end
   end
diff --git a/app/controllers/admin/plow_controller.rb b/app/controllers/admin/plow_controller.rb
index 18b11ab..1447109 100644
--- a/app/controllers/admin/plow_controller.rb
+++ b/app/controllers/admin/plow_controller.rb
@@ -60,7 +60,7 @@ class Admin::PlowController < ApplicationController
 private
   def check_login
     user = current_user
-    if user.nil? || user.is_admin?
+    if user.nil? || !user.is_admin?
       return render :file => "#{Rails.root}/app/views/errors/404.html", :layout => false, :status => :not_found, :formats => [:html] 
     end
   end