diff --git a/app/helpers/projects_helper.rb b/app/helpers/projects_helper.rb
index e8115205b..3e1f0d804 100644
--- a/app/helpers/projects_helper.rb
+++ b/app/helpers/projects_helper.rb
@@ -120,11 +120,16 @@ module ProjectsHelper
       end
     end if include_in_api_response?('issue_categories')
 
+    api.array :time_entry_activities do
+      project.activities.each do |activity|
+        api.time_entry_activity(:id => activity.id, :name => activity.name)
+      end
+    end if include_in_api_response?('time_entry_activities')
+
     api.array :enabled_modules do
       project.enabled_modules.each do |enabled_module|
         api.enabled_module(:id => enabled_module.id, :name => enabled_module.name)
       end
     end if include_in_api_response?('enabled_modules')
-
   end
 end
diff --git a/test/integration/api_test/projects_test.rb b/test/integration/api_test/projects_test.rb
index 7f9eeeb54..7b9c58a13 100644
--- a/test/integration/api_test/projects_test.rb
+++ b/test/integration/api_test/projects_test.rb
@@ -114,6 +114,14 @@ class Redmine::ApiTest::ProjectsTest < Redmine::ApiTest::Base
     assert_select 'issue_categories[type=array] issue_category[id="2"][name=Recipes]'
   end
 
+  test "GET /projects/:id.xml with include=time_entry_activities should return activities" do
+    get '/projects/1.xml?include=time_entry_activities'
+    assert_response :success
+    assert_equal 'application/xml', @response.content_type
+
+    assert_select 'time_entry_activities[type=array] time_entry_activity[id="10"][name=Development]'
+  end
+
   test "GET /projects/:id.xml with include=trackers should return trackers" do
     get '/projects/1.xml?include=trackers'
     assert_response :success