diff --git a/Library/Homebrew/default_prefix.rb b/Library/Homebrew/default_prefix.rb
index de132865d9..81c85ebcaa 100644
--- a/Library/Homebrew/default_prefix.rb
+++ b/Library/Homebrew/default_prefix.rb
@@ -1,15 +1,9 @@
 # typed: true
 # frozen_string_literal: true
 
-require "simulate_system"
-
 module Homebrew
-  # TODO: Refactor and move to extend/os
-  DEFAULT_PREFIX, DEFAULT_REPOSITORY = if OS.mac? && Hardware::CPU.arm? # rubocop:disable Homebrew/MoveToExtendOS
-    [HOMEBREW_MACOS_ARM_DEFAULT_PREFIX, HOMEBREW_MACOS_ARM_DEFAULT_REPOSITORY]
-  elsif Homebrew::SimulateSystem.simulating_or_running_on_linux?
-    [HOMEBREW_LINUX_DEFAULT_PREFIX, HOMEBREW_LINUX_DEFAULT_REPOSITORY]
-  else
-    [HOMEBREW_DEFAULT_PREFIX, HOMEBREW_DEFAULT_REPOSITORY]
-  end.freeze
+  DEFAULT_PREFIX = HOMEBREW_DEFAULT_PREFIX
+  DEFAULT_REPOSITORY = HOMEBREW_DEFAULT_REPOSITORY
 end
+
+require "extend/os/default_prefix"
diff --git a/Library/Homebrew/extend/os/default_prefix.rb b/Library/Homebrew/extend/os/default_prefix.rb
new file mode 100644
index 0000000000..01051c964c
--- /dev/null
+++ b/Library/Homebrew/extend/os/default_prefix.rb
@@ -0,0 +1,8 @@
+# typed: true
+# frozen_string_literal: true
+
+if OS.mac?
+  require "extend/os/mac/default_prefix"
+elsif OS.linux?
+  require "extend/os/linux/default_prefix"
+end
diff --git a/Library/Homebrew/extend/os/linux/default_prefix.rb b/Library/Homebrew/extend/os/linux/default_prefix.rb
new file mode 100644
index 0000000000..d72987236a
--- /dev/null
+++ b/Library/Homebrew/extend/os/linux/default_prefix.rb
@@ -0,0 +1,10 @@
+# typed: true
+# frozen_string_literal: true
+
+module Homebrew
+  remove_const(:DEFAULT_PREFIX)
+  DEFAULT_PREFIX = HOMEBREW_LINUX_DEFAULT_PREFIX
+
+  remove_const(:DEFAULT_REPOSITORY)
+  DEFAULT_REPOSITORY = HOMEBREW_LINUX_DEFAULT_REPOSITORY
+end
diff --git a/Library/Homebrew/extend/os/mac/default_prefix.rb b/Library/Homebrew/extend/os/mac/default_prefix.rb
new file mode 100644
index 0000000000..330e326598
--- /dev/null
+++ b/Library/Homebrew/extend/os/mac/default_prefix.rb
@@ -0,0 +1,17 @@
+# typed: true
+# frozen_string_literal: true
+
+require "simulate_system"
+
+module Homebrew
+  if Hardware::CPU.arm? || Homebrew::SimulateSystem.simulating_or_running_on_linux?
+    remove_const(:DEFAULT_PREFIX)
+    remove_const(:DEFAULT_REPOSITORY)
+
+    DEFAULT_PREFIX, DEFAULT_REPOSITORY = if Hardware::CPU.arm?
+      [HOMEBREW_MACOS_ARM_DEFAULT_PREFIX, HOMEBREW_MACOS_ARM_DEFAULT_REPOSITORY]
+    elsif Homebrew::SimulateSystem.simulating_or_running_on_linux?
+      [HOMEBREW_LINUX_DEFAULT_PREFIX, HOMEBREW_LINUX_DEFAULT_REPOSITORY]
+    end
+  end
+end