diff --git a/lib/rjgit_adapter/git_layer_rjgit.rb b/lib/rjgit_adapter/git_layer_rjgit.rb
index 810dd1b..57e2f00 100644
--- a/lib/rjgit_adapter/git_layer_rjgit.rb
+++ b/lib/rjgit_adapter/git_layer_rjgit.rb
@@ -434,8 +434,8 @@ def log(ref = Gollum::Git.default_ref_for_repo(@repo), path = nil, options = {})
         git.log(Gollum::Git.canonicalize(ref), path, options)
       end
       
-      def lstree(sha, options={})
-        entries = RJGit::Porcelain.ls_tree(@repo.jrepo, nil, @repo.find(sha, :tree), {:recursive => options[:recursive]})
+      def lstree(sha, path=nil, options={})
+        entries = RJGit::Porcelain.ls_tree(@repo.jrepo, path, @repo.find(sha, :tree), {:recursive => options[:recursive]})
         entries.map! do |entry| 
           entry[:mode] = entry[:mode]
           entry[:sha]  = entry[:id]