diff --git a/Library/Homebrew/brew.rb b/Library/Homebrew/brew.rb
index 9b2ff75f0c..f3e40fc143 100644
--- a/Library/Homebrew/brew.rb
+++ b/Library/Homebrew/brew.rb
@@ -21,6 +21,7 @@ if ARGV == %w[--version] || ARGV == %w[-v]
 end
 
 def require?(path)
+  return false if path.nil?
   require path
 rescue LoadError => e
   # we should raise on syntax errors but not if the file doesn't exist.