diff --git a/lib/letter_avatar/avatar.rb b/lib/letter_avatar/avatar.rb
index b9aad2d..155d272 100644
--- a/lib/letter_avatar/avatar.rb
+++ b/lib/letter_avatar/avatar.rb
@@ -18,7 +18,7 @@ module LetterAvatar
           identity.color = LetterAvatar::COLORS[
               Digest::MD5.hexdigest(username)[0...15].to_i(16) % LetterAvatar::COLORS.length
           ]
-          identity.letter = username[0].upcase
+          identity.letter = username.first.upcase
 
           identity
         end
--
libgit2 0.21.0