diff --git a/lib/jekyll-pandoc-multiple-formats/generator.rb b/lib/jekyll-pandoc-multiple-formats/generator.rb
index ead0a13b7259cc2ca185812980973ac0f94c4168..d97055ed195bb47d3b18a7402c8c3692010ad1aa 100644
--- a/lib/jekyll-pandoc-multiple-formats/generator.rb
+++ b/lib/jekyll-pandoc-multiple-formats/generator.rb
@@ -37,7 +37,7 @@ class PandocGenerator < Generator
     # we create a single array of files
     @pandoc_files = []
 
-    @config.outputs.each_pair do |output, extra_flags|
+    @config.outputs.each_pair do |output, _|
       @site.posts.docs.each do |post|
         Jekyll::Hooks.trigger :posts, :pre_render, post, nil