diff --git a/Library/Homebrew/cmd/outdated.rb b/Library/Homebrew/cmd/outdated.rb
index b93a76a3b2..0dda1be8b4 100644
--- a/Library/Homebrew/cmd/outdated.rb
+++ b/Library/Homebrew/cmd/outdated.rb
@@ -197,7 +197,7 @@ module Homebrew
       if formula_or_cask.is_a?(Formula)
         formula_or_cask.outdated?(fetch_head: args.fetch_HEAD?)
       else
-        formula_or_cask.outdated?(args.greedy?)
+        formula_or_cask.outdated?(greedy: args.greedy?)
       end
     end
   end