diff --git a/Library/Homebrew/options.rb b/Library/Homebrew/options.rb
index c3b15b06ef..b9a5aaef04 100644
--- a/Library/Homebrew/options.rb
+++ b/Library/Homebrew/options.rb
@@ -16,6 +16,7 @@ class Option
   alias_method :to_str, :to_s
 
   def <=>(other)
+    return unless Option === other
     name <=> other.name
   end