diff --git a/Library/Homebrew/download_strategy.rb b/Library/Homebrew/download_strategy.rb
index b99a0b0051..43d10ae9ff 100644
--- a/Library/Homebrew/download_strategy.rb
+++ b/Library/Homebrew/download_strategy.rb
@@ -487,10 +487,10 @@ class MercurialDownloadStrategy < AbstractDownloadStrategy
       if @spec and @ref
         ohai "Checking out #{@spec} #{@ref}"
         Dir.chdir @clone do
-          safe_system 'hg', 'archive', '-y', '-r', @ref, '-t', 'files', dst
+          safe_system 'hg', 'archive', '--subrepos', '-y', '-r', @ref, '-t', 'files', dst
         end
       else
-        safe_system 'hg', 'archive', '-y', '-t', 'files', dst
+        safe_system 'hg', 'archive', '--subrepos', '-y', '-t', 'files', dst
       end
     end
   end