diff --git a/app/helpers/asciicasts_helper.rb b/app/helpers/asciicasts_helper.rb
index 41646f0..80d46e5 100644
--- a/app/helpers/asciicasts_helper.rb
+++ b/app/helpers/asciicasts_helper.rb
@@ -23,7 +23,7 @@ module AsciicastsHelper
       renderer_class: renderer_class,
       auto_play: options.key?(:auto_play) ? !!options[:auto_play] : false,
       hud: options.key?(:hud) ? !!options[:hud] : true,
-      size: params[:size] || 'small'
+      size: options[:size] || params[:size] || 'small'
     }
   end