diff --git a/Library/Homebrew/cmd/--prefix.rb b/Library/Homebrew/cmd/--prefix.rb
index 19ead9ce40..51bda5716d 100644
--- a/Library/Homebrew/cmd/--prefix.rb
+++ b/Library/Homebrew/cmd/--prefix.rb
@@ -74,6 +74,7 @@ module Homebrew
     lib/gio/*
     lib/node_modules/*
     lib/python[23].[0-9]/*
+    lib/python3.[0-9][0-9]/*
     lib/pypy/*
     lib/pypy3/*
     lib/ruby/gems/[12].*
diff --git a/Library/Homebrew/keg.rb b/Library/Homebrew/keg.rb
index c5bad0889b..7680dab013 100644
--- a/Library/Homebrew/keg.rb
+++ b/Library/Homebrew/keg.rb
@@ -452,7 +452,7 @@ class Keg
            /^ocaml/,
            /^perl5/,
            "php",
-           /^python[23]\.\d/,
+           /^python[23]\.\d+/,
            /^R/,
            /^ruby/
         :mkpath