diff --git a/app/decorators/asciicast_decorator.rb b/app/decorators/asciicast_decorator.rb
index aa1bffb..85170f6 100644
--- a/app/decorators/asciicast_decorator.rb
+++ b/app/decorators/asciicast_decorator.rb
@@ -101,7 +101,7 @@ class AsciicastDecorator < ApplicationDecorator
 
   def embed_script
     src = h.asciicast_url(model, :format => :js)
-    id = "asciicast-#{id}"
+    id = "asciicast-#{model.id}"
     %(<script type="text/javascript" src="#{src}" id="#{id}" async></script>)
   end
 
diff --git a/spec/decorators/asciicast_decorator_spec.rb b/spec/decorators/asciicast_decorator_spec.rb
index 016d9c5..9ee0872 100644
--- a/spec/decorators/asciicast_decorator_spec.rb
+++ b/spec/decorators/asciicast_decorator_spec.rb
@@ -247,7 +247,7 @@ describe AsciicastDecorator do
     end
 
     it 'should be an async script tag including asciicast id' do
-      expect(decorated.embed_script).to match(/^<script[^>]+\b123\b[^>]+><\/script>/)
+      expect(decorated.embed_script).to match(/^<script[^>]+src="[^"]+\b123\b[^"]*\.js"[^>]+id="asciicast-123"[^>]*><\/script>/)
     end
   end
 end