diff --git a/lib/redmine/scm/adapters/mercurial_adapter.rb b/lib/redmine/scm/adapters/mercurial_adapter.rb
index 10aac3264..9d29caefa 100644
--- a/lib/redmine/scm/adapters/mercurial_adapter.rb
+++ b/lib/redmine/scm/adapters/mercurial_adapter.rb
@@ -111,7 +111,6 @@ module Redmine
 
         def summary
           return @summary if @summary 
-          doc = nil
           hg 'rhsummary' do |io|
             begin
               @summary = ActiveSupport::XmlMini.parse(io.read)['rhsummary']