diff --git a/Library/Homebrew/dev-cmd/extract.rb b/Library/Homebrew/dev-cmd/extract.rb
index d149fd432a..a2f695282d 100644
--- a/Library/Homebrew/dev-cmd/extract.rb
+++ b/Library/Homebrew/dev-cmd/extract.rb
@@ -96,7 +96,7 @@ module Homebrew
       switch "-f", "--force",
              description: "Overwrite the destination formula if it already exists."
 
-      named_args number: 2
+      named_args [:formula, :tap], number: 2
     end
   end