diff --git a/Library/Homebrew/formula_cellar_checks.rb b/Library/Homebrew/formula_cellar_checks.rb
index 918301ac16..a5d9beda08 100644
--- a/Library/Homebrew/formula_cellar_checks.rb
+++ b/Library/Homebrew/formula_cellar_checks.rb
@@ -150,6 +150,7 @@ module FormulaCellarChecks
   private
 
   def relative_glob(dir, pattern)
+    return [] unless Dir.exist? dir
     Dir.chdir(dir) { Dir[pattern] }
   end
 end