diff --git a/Library/Homebrew/cmd/doctor.rb b/Library/Homebrew/cmd/doctor.rb
index deb09daa155feb8445bdc4799716adae6f5ae86b..79091b7dbde0587f999edf16327bf378880ad424 100644
--- a/Library/Homebrew/cmd/doctor.rb
+++ b/Library/Homebrew/cmd/doctor.rb
@@ -751,6 +751,8 @@ end
 def check_for_linked_keg_only_brews
   require 'formula'
 
+  return unless HOMEBREW_CELLAR.exist?
+
   warnings = Hash.new
 
   Formula.each do |f|