diff --git a/.rubocop.yml b/.rubocop.yml
index 5d150784c..3c86a6ee8 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -397,6 +397,9 @@ Style/MutableConstant:
 Style/Not:
   Enabled: true
 
+Style/OrAssignment:
+  Enabled: true
+
 Style/PercentLiteralDelimiters:
   Enabled: true
 
diff --git a/app/controllers/admin/banners_controller.rb b/app/controllers/admin/banners_controller.rb
index 9acc6f2ee..afbf009f4 100644
--- a/app/controllers/admin/banners_controller.rb
+++ b/app/controllers/admin/banners_controller.rb
@@ -62,7 +62,6 @@ class Admin::BannersController < Admin::BaseController
     end
 
     def resource
-      @banner = Banner.find(params[:id]) unless @banner
-      @banner
+      @banner ||= Banner.find(params[:id])
     end
 end