diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 891d012b..34469d09 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -158,4 +158,4 @@ When updating Rubygems for gitsh, there are a few things to consider:
 - Use the minimum supported Ruby version when updating gems to avoid
   installing versions that are incompatible with older Rubies.
 
-[style-guide]: https://github.com/thoughtbot/guides/tree/master/style#ruby
+[style-guide]: https://github.com/thoughtbot/guides/tree/master/ruby
diff --git a/homebrew/gitsh.rb.in b/homebrew/gitsh.rb.in
index fac6316f..295afacd 100644
--- a/homebrew/gitsh.rb.in
+++ b/homebrew/gitsh.rb.in
@@ -44,6 +44,6 @@ class Gitsh < Formula
   end
 
   def set_architecture
-    ENV['READLINE_ARCH'] = "-arch #{MacOS.preferred_arch}"
+    ENV['READLINE_ARCH'] = "-arch #{Hardware::CPU.arch}"
   end
 end