diff --git a/lib/jekyll-avatar.rb b/lib/jekyll-avatar.rb
index 27b1066..1e019dd 100644
--- a/lib/jekyll-avatar.rb
+++ b/lib/jekyll-avatar.rb
@@ -1,4 +1,4 @@
-require "zlib"
+require 'zlib'
 
 module Jekyll
   class Avatar < Liquid::Tag