diff --git a/app/controllers/projects_controller.rb b/app/controllers/projects_controller.rb
index c2a17e359..aa2927c83 100644
--- a/app/controllers/projects_controller.rb
+++ b/app/controllers/projects_controller.rb
@@ -162,7 +162,7 @@ class ProjectsController < ApplicationController
       return
     end
 
-    @users_by_role = @project.users_by_role
+    @principals_by_role = @project.principals_by_role
     @subprojects = @project.children.visible.to_a
     @news = @project.news.limit(5).includes(:author, :project).reorder("#{News.table_name}.created_on DESC").to_a
     @trackers = @project.rolled_up_trackers.visible
diff --git a/app/models/project.rb b/app/models/project.rb
index 526d479f3..e68e44054 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -507,12 +507,12 @@ class Project < ActiveRecord::Base
     end
   end
 
-  # Returns a hash of project users grouped by role
-  def users_by_role
-    members.includes(:user, :roles).inject({}) do |h, m|
+  # Returns a hash of project users/groups grouped by role
+  def principals_by_role
+    memberships.includes(:principal, :roles).inject({}) do |h, m|
       m.roles.each do |r|
         h[r] ||= []
-        h[r] << m.user
+        h[r] << m.principal
       end
       h
     end
diff --git a/app/views/projects/_members_box.html.erb b/app/views/projects/_members_box.html.erb
index 1a088ead4..e915ab910 100644
--- a/app/views/projects/_members_box.html.erb
+++ b/app/views/projects/_members_box.html.erb
@@ -1,8 +1,8 @@
-  <% if @users_by_role.any? %>
+  <% if @principals_by_role.any? %>
   <div class="members box">
     <h3 class="icon icon-group"><%=l(:label_member_plural)%></h3>
-    <% @users_by_role.keys.sort.each do |role| %>
-      <p><span class="label"><%= role %>:</span> <%= @users_by_role[role].sort.collect{|u| link_to_user u}.join(", ").html_safe %></p>
+    <% @principals_by_role.keys.sort.each do |role| %>
+      <p><span class="label"><%= role %>:</span> <%= @principals_by_role[role].sort.collect{|p| link_to_user p}.join(", ").html_safe %></p>
     <% end %>
   </div>
   <% end %>
diff --git a/test/unit/project_test.rb b/test/unit/project_test.rb
index 9475e764a..5fc3743d5 100644
--- a/test/unit/project_test.rb
+++ b/test/unit/project_test.rb
@@ -455,12 +455,16 @@ class ProjectTest < ActiveSupport::TestCase
     assert Project.find(3).allowed_parents.include?(nil)
   end
 
-  def test_users_by_role
-    users_by_role = Project.find(1).users_by_role
-    assert_kind_of Hash, users_by_role
+  def test_principals_by_role
+    group = Group.find(10)
+    Member.create!(:principal => group, :project_id => 1, :role_ids => [1])
+
+    principals_by_role = Project.find(1).principals_by_role
+    assert_kind_of Hash, principals_by_role
     role = Role.find(1)
-    assert_kind_of Array, users_by_role[role]
-    assert users_by_role[role].include?(User.find(2))
+    assert_kind_of Array, principals_by_role[role]
+    assert principals_by_role[role].include?(User.find(2))
+    assert principals_by_role[role].include?(group)
   end
 
   def test_rolled_up_trackers