diff --git a/Library/Homebrew/extend/os/mac/keg.rb b/Library/Homebrew/extend/os/mac/keg.rb
index c0b1e3fcc3..8f39770182 100644
--- a/Library/Homebrew/extend/os/mac/keg.rb
+++ b/Library/Homebrew/extend/os/mac/keg.rb
@@ -3,4 +3,6 @@
 class Keg
   GENERIC_KEG_LINK_DIRECTORIES = (remove_const :KEG_LINK_DIRECTORIES).freeze
   KEG_LINK_DIRECTORIES = (GENERIC_KEG_LINK_DIRECTORIES + ["Frameworks"]).freeze
+  GENERIC_MUST_EXIST_DIRECTORIES = (remove_const :MUST_EXIST_DIRECTORIES).freeze
+  MUST_EXIST_DIRECTORIES = (GENERIC_MUST_EXIST_DIRECTORIES + [HOMEBREW_PREFIX/"Frameworks"]).sort.uniq.freeze
 end
diff --git a/Library/Homebrew/keg.rb b/Library/Homebrew/keg.rb
index 523c027074..83ccdb3272 100644
--- a/Library/Homebrew/keg.rb
+++ b/Library/Homebrew/keg.rb
@@ -75,7 +75,7 @@ class Keg
       opt
       var/homebrew/linked
     ]
-  ).map { |dir| HOMEBREW_PREFIX/dir }.uniq.sort.freeze
+  ).map { |dir| HOMEBREW_PREFIX/dir }.sort.uniq.freeze
 
   # Keep relatively in sync with
   # https://github.com/Homebrew/install/blob/master/install
@@ -98,7 +98,7 @@ class Keg
       HOMEBREW_REPOSITORY,
       Language::Python.homebrew_site_packages,
     ]
-  ).uniq.sort.freeze
+  ).sort.uniq.freeze
 
   # These paths relative to the keg's share directory should always be real
   # directories in the prefix, never symlinks.
diff --git a/Library/Homebrew/test/spec_helper.rb b/Library/Homebrew/test/spec_helper.rb
index 407567d890..52ec17548e 100644
--- a/Library/Homebrew/test/spec_helper.rb
+++ b/Library/Homebrew/test/spec_helper.rb
@@ -185,6 +185,7 @@ RSpec.configure do |config|
         HOMEBREW_PINNED_KEGS,
         HOMEBREW_PREFIX/"var",
         HOMEBREW_PREFIX/"Caskroom",
+        HOMEBREW_PREFIX/"Frameworks",
         HOMEBREW_LIBRARY/"Taps/homebrew/homebrew-cask",
         HOMEBREW_LIBRARY/"Taps/homebrew/homebrew-bar",
         HOMEBREW_LIBRARY/"Taps/homebrew/homebrew-bundle",