diff --git a/Library/Homebrew/extend/kernel.rb b/Library/Homebrew/extend/kernel.rb
index 4ca7b2fd34..50484d47de 100644
--- a/Library/Homebrew/extend/kernel.rb
+++ b/Library/Homebrew/extend/kernel.rb
@@ -64,8 +64,11 @@ module Kernel
   # @api public
   sig { params(message: T.any(String, Exception)).void }
   def opoo(message)
+    require "utils/github/actions"
     return if GitHub::Actions.puts_annotation_if_env_set(:warning, message.to_s)
 
+    require "utils/formatter"
+
     Tty.with($stderr) do |stderr|
       stderr.puts Formatter.warning(message, label: "Warning")
     end