diff --git a/lib/simple_json/simple_json_renderable.rb b/lib/simple_json/simple_json_renderable.rb
index eaff277..c583e63 100644
--- a/lib/simple_json/simple_json_renderable.rb
+++ b/lib/simple_json/simple_json_renderable.rb
@@ -29,7 +29,7 @@ def render_to_body(options)
       # use super when any of [:body, :plain, :html] exist in options
       return super if self.class::RENDER_FORMATS_IN_PRIORITY.any? { |key| options.key? key }
 
-      template_name = template_name(options[:template] || action_name)
+      template_name = template_name(options[:template] || options[:action] || action_name)
       if options.key?(:json)
         process_options(options)
         @rendered_format = 'application/json; charset=utf-8'
diff --git a/test/dummy_app/app/controllers/api/posts_controller.rb b/test/dummy_app/app/controllers/api/posts_controller.rb
index 3722553..a0f0a9b 100644
--- a/test/dummy_app/app/controllers/api/posts_controller.rb
+++ b/test/dummy_app/app/controllers/api/posts_controller.rb
@@ -8,6 +8,12 @@ class PostsController < ActionController::API
       def show(id)
         @post = Post.find id
       end
+
+      def renamed_show(id)
+        @post = Post.find id
+
+        render :show
+      end
     end
   end
 end
diff --git a/test/dummy_app/config/routes.rb b/test/dummy_app/config/routes.rb
index f95f929..87c4299 100644
--- a/test/dummy_app/config/routes.rb
+++ b/test/dummy_app/config/routes.rb
@@ -20,6 +20,7 @@
   if Rails::VERSION::MAJOR >= 5
     namespace :api do
       resources :posts, only: :show
+      get '/renamed_posts/:id', to: 'posts#renamed_show'
     end
   end
   # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
diff --git a/test/features/action_controller_api_test.rb b/test/features/action_controller_api_test.rb
index 76871f0..cb72c13 100644
--- a/test/features/action_controller_api_test.rb
+++ b/test/features/action_controller_api_test.rb
@@ -12,6 +12,14 @@ class ActionControllerAPITest < ActionDispatch::IntegrationTest
 
       assert_equal json, { 'title' => 'post 1' }
     end
+
+    test 'The renamed template correctly renders a JSON' do
+      get '/api/renamed_posts/1.json'
+
+      json = response.parsed_body
+
+      assert_equal json, { 'title' => 'post 1' }
+    end
   end
 
 end