diff --git a/lib/homesick/shell.rb b/lib/homesick/shell.rb
index a8e6141..d53dbda 100644
--- a/lib/homesick/shell.rb
+++ b/lib/homesick/shell.rb
@@ -1,3 +1,5 @@
+require 'thor'
+
 module Homesick
   # Hack in support for diffing symlinks
   class Shell < Thor::Shell::Color