diff --git a/test/unit/helpers/application_helper_test.rb b/test/unit/helpers/application_helper_test.rb
index a9dd4b3b4..7e6c15585 100644
--- a/test/unit/helpers/application_helper_test.rb
+++ b/test/unit/helpers/application_helper_test.rb
@@ -18,6 +18,8 @@
 require File.expand_path('../../../test_helper', __FILE__)
 
 class ApplicationHelperTest < ActionView::TestCase
+  include ERB::Util
+
   fixtures :projects, :roles, :enabled_modules, :users,
            :repositories, :changesets,
            :trackers, :issue_statuses, :issues, :versions, :documents,
diff --git a/test/unit/helpers/custom_fields_helper_test.rb b/test/unit/helpers/custom_fields_helper_test.rb
index 17c513d15..f353c2aa9 100644
--- a/test/unit/helpers/custom_fields_helper_test.rb
+++ b/test/unit/helpers/custom_fields_helper_test.rb
@@ -20,6 +20,7 @@ require File.expand_path('../../../test_helper', __FILE__)
 class CustomFieldsHelperTest < ActionView::TestCase
   include CustomFieldsHelper
   include Redmine::I18n
+  include ERB::Util
 
   def test_format_boolean_value
     I18n.locale = 'en'
diff --git a/test/unit/helpers/projects_helper_test.rb b/test/unit/helpers/projects_helper_test.rb
index dd94898ff..b88d922fe 100644
--- a/test/unit/helpers/projects_helper_test.rb
+++ b/test/unit/helpers/projects_helper_test.rb
@@ -20,6 +20,7 @@ require File.expand_path('../../../test_helper', __FILE__)
 class ProjectsHelperTest < ActionView::TestCase
   include ApplicationHelper
   include ProjectsHelper
+  include ERB::Util
 
   fixtures :projects, :trackers, :issue_statuses, :issues,
            :enumerations, :users, :issue_categories,
diff --git a/test/unit/helpers/sort_helper_test.rb b/test/unit/helpers/sort_helper_test.rb
index bf5b4e85a..a88683945 100644
--- a/test/unit/helpers/sort_helper_test.rb
+++ b/test/unit/helpers/sort_helper_test.rb
@@ -19,6 +19,7 @@ require File.expand_path('../../../test_helper', __FILE__)
 
 class SortHelperTest < ActionView::TestCase
   include SortHelper
+  include ERB::Util
 
   def setup
     @session = nil
diff --git a/test/unit/helpers/timelog_helper_test.rb b/test/unit/helpers/timelog_helper_test.rb
index 9e52519e3..4d5078555 100644
--- a/test/unit/helpers/timelog_helper_test.rb
+++ b/test/unit/helpers/timelog_helper_test.rb
@@ -21,6 +21,7 @@ class TimelogHelperTest < ActionView::TestCase
   include TimelogHelper
   include ActionView::Helpers::TextHelper
   include ActionView::Helpers::DateHelper
+  include ERB::Util
 
   fixtures :projects, :roles, :enabled_modules, :users,
                       :repositories, :changesets,