diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 3712b8a05..d16547ab2 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -1507,7 +1507,7 @@ module ApplicationHelper
   # Returns a link to edit user's avatar if avatars are enabled
   def avatar_edit_link(user, options={})
     if Setting.gravatar_enabled?
-      url = "https://gravatar.com"
+      url = avatar_server_url
       link_to avatar(user, {:title => l(:button_edit)}.merge(options)), url, :target => '_blank'
     end
   end
diff --git a/config/configuration.yml.example b/config/configuration.yml.example
index bff4c9740..1b3372c54 100644
--- a/config/configuration.yml.example
+++ b/config/configuration.yml.example
@@ -209,6 +209,19 @@ default:
   # allowed values: :memory, :file, :memcache
   #openid_authentication_store: :memory
 
+  # URL of the avatar service
+  #
+  # By default, Redmine uses Gravatar as the avatar service for displaying
+  # the user's icon. You can swich to another Gravatar-compatible service
+  # such as Libravatar.
+  #
+  # URL of each avatar is: #{avatar_server_url}/avatar/#{hash}
+  #
+  # Examples:
+  # avatar_server_url: https://www.gravatar.com        # default
+  # avatar_server_url: https://seccdn.libravatar.org
+  avatar_server_url:
+
 # specific configuration options for production environment
 # that overrides the default ones
 production:
diff --git a/lib/plugins/gravatar/lib/gravatar.rb b/lib/plugins/gravatar/lib/gravatar.rb
index 7c2fca6d3..2658610b0 100644
--- a/lib/plugins/gravatar/lib/gravatar.rb
+++ b/lib/plugins/gravatar/lib/gravatar.rb
@@ -63,7 +63,7 @@ module GravatarHelper
 
     # Returns the base Gravatar URL for the given email hash
     def gravatar_api_url(hash)
-      'https://www.gravatar.com/avatar/' + hash.to_s
+      +"#{avatar_server_url}/avatar/#{hash}"
     end
 
     # Return the gravatar URL for the given email address.
@@ -83,6 +83,10 @@ module GravatarHelper
       end
     end
 
+    def avatar_server_url
+      @avatar_server_url ||= Redmine::Configuration['avatar_server_url'] || 'https://www.gravatar.com'
+    end
+
   end
 
 end
diff --git a/test/functional/my_controller_test.rb b/test/functional/my_controller_test.rb
index d761d5b8e..37b6d61ae 100644
--- a/test/functional/my_controller_test.rb
+++ b/test/functional/my_controller_test.rb
@@ -367,7 +367,8 @@ class MyControllerTest < Redmine::ControllerTest
     with_settings :gravatar_enabled => '1' do
       get :account
       assert_response :success
-      assert_select 'a[href=?] img.gravatar', 'https://gravatar.com'
+      assert_select 'a[href=?] img.gravatar',
+        Redmine::Configuration['avatar_server_url'] || 'https://www.gravatar.com'
     end
   end
 
diff --git a/test/helpers/application_helper_test.rb b/test/helpers/application_helper_test.rb
index 74acae4b0..188424a34 100644
--- a/test/helpers/application_helper_test.rb
+++ b/test/helpers/application_helper_test.rb
@@ -1529,6 +1529,25 @@ RAW
     end
   end
 
+  def test_avatar_server_url
+    to_test = {
+      'https://seccdn.libravatar.org' => %r|https://seccdn.libravatar.org/avatar/\h{32}|,
+      'http://localhost:8080' => %r|http://localhost:8080/avatar/\h{32}|,
+      # gravatar.com is used by default
+      nil => %r|https://www.gravatar.com/avatar/\h{32}|
+    }
+    with_settings :gravatar_enabled => '1' do
+      to_test.each do |url, expected|
+        @avatar_server_url = nil
+        Redmine::Configuration.with 'avatar_server_url' => url do
+          assert_match expected, avatar('<jsmith@somenet.foo>')
+        end
+      end
+    end
+  ensure
+    @avatar_server_url = nil
+  end
+
   def test_link_to_user
     user = User.find(2)
     result = link_to("John Smith", "/users/2", :class => "user active")