diff --git a/Library/Homebrew/dependency.rb b/Library/Homebrew/dependency.rb
index dfb3374460..1a838aaeeb 100644
--- a/Library/Homebrew/dependency.rb
+++ b/Library/Homebrew/dependency.rb
@@ -42,7 +42,7 @@ class Dependency
     installed? && missing_options(inherited_options).empty?
   end
 
-  def missing_options(inherited_options=[])
+  def missing_options(inherited_options)
     missing = options | inherited_options
     missing -= Tab.for_formula(to_formula).used_options
     missing