diff --git a/Library/Homebrew/extend/os/formula.rb b/Library/Homebrew/extend/os/formula.rb
index aef771325f..5a520cf8a3 100644
--- a/Library/Homebrew/extend/os/formula.rb
+++ b/Library/Homebrew/extend/os/formula.rb
@@ -1,4 +1,8 @@
 # typed: strict
 # frozen_string_literal: true
 
-require "extend/os/linux/formula" if OS.linux?
+if OS.mac?
+  require "extend/os/mac/formula"
+elsif OS.linux?
+  require "extend/os/linux/formula"
+end