diff --git a/Library/Homebrew/download_strategy.rb b/Library/Homebrew/download_strategy.rb
index 2fb7d7c979..6176e4970f 100644
--- a/Library/Homebrew/download_strategy.rb
+++ b/Library/Homebrew/download_strategy.rb
@@ -68,6 +68,9 @@ class CurlDownloadStrategy <AbstractDownloadStrategy
   def stage
     if @tarball_path.extname == '.jar'
       magic_bytes = nil
+    elsif @tarball_path.extname == '.pkg'
+      # Use more than 4 characters to not clash with magicbytes
+      magic_bytes = "____pkg"
     else
       # get the first four bytes
       File.open(@tarball_path) { |f| magic_bytes = f.read(4) }
@@ -82,6 +85,9 @@ class CurlDownloadStrategy <AbstractDownloadStrategy
       # TODO check if it's really a tar archive
       safe_system '/usr/bin/tar', 'xf', @tarball_path
       chdir
+    when '____pkg'
+      safe_system '/usr/sbin/pkgutil', '--expand', @tarball_path, File.basename(@url)
+      chdir
     when 'Rar!'
       quiet_safe_system 'unrar', 'x', {:quiet_flag => '-inul'}, @tarball_path
     else