diff --git a/lib/redmine/scm/adapters/cvs_adapter.rb b/lib/redmine/scm/adapters/cvs_adapter.rb
index 0cdc2fc93..47fac7a3d 100644
--- a/lib/redmine/scm/adapters/cvs_adapter.rb
+++ b/lib/redmine/scm/adapters/cvs_adapter.rb
@@ -229,7 +229,7 @@ module Redmine
         def diff(path, identifier_from, identifier_to=nil)
           logger.debug "<cvs> diff path:'#{path}',identifier_from #{identifier_from}, identifier_to #{identifier_to}"
           path_with_project="#{url}#{with_leading_slash(path)}"
-          cmd = "#{CVS_BIN} -d #{shell_quote root_url} rdiff -u -r#{identifier_to.to_i} -r#{identifier_from.to_i} #{shell_quote path_with_project}"
+          cmd = "#{CVS_BIN} -d #{shell_quote root_url} rdiff -u -r#{identifier_to} -r#{identifier_from} #{shell_quote path_with_project}"
           diff = []
           shellout(cmd) do |io|
             io.each_line do |line|
diff --git a/test/functional/repositories_cvs_controller_test.rb b/test/functional/repositories_cvs_controller_test.rb
index 57b616616..58b44ec14 100644
--- a/test/functional/repositories_cvs_controller_test.rb
+++ b/test/functional/repositories_cvs_controller_test.rb
@@ -22,6 +22,7 @@ require 'repositories_controller'
 class RepositoriesController; def rescue_action(e) raise e end; end
 
 class RepositoriesCvsControllerTest < ActionController::TestCase
+  fixtures :projects, :users, :roles, :members, :member_roles, :repositories, :enabled_modules
 
   # No '..' in the repository path
   REPOSITORY_PATH = RAILS_ROOT.gsub(%r{config\/\.\.}, '') + '/tmp/test/cvs_repository'