diff --git a/Library/Homebrew/cli/named_args.rb b/Library/Homebrew/cli/named_args.rb
index cde0735ddd..06fb0b3d13 100644
--- a/Library/Homebrew/cli/named_args.rb
+++ b/Library/Homebrew/cli/named_args.rb
@@ -3,6 +3,7 @@
 require "cask/cask_loader"
 require "delegate"
 require "formulary"
+require "missing_formula"
 
 module Homebrew
   module CLI