diff --git a/app/models/person_notifier.rb b/app/models/person_notifier.rb
index 62761a4..fa2a1f9 100644
--- a/app/models/person_notifier.rb
+++ b/app/models/person_notifier.rb
@@ -84,8 +84,8 @@ class PersonNotifier
 
     def content_summary(person, notifications, tasks)
       if person.environment
-        ActionMailer::Base.asset_host = person.environment.top_url
-        ActionMailer::Base.default_url_options[:host] = person.environment.top_url.gsub(/^(https?:)?/, '')
+        ActionMailer::Base.asset_host = person.environment.default_hostname
+        ActionMailer::Base.default_url_options[:host] = person.environment.default_hostname
       end
 
       @current_theme = 'default'
diff --git a/test/unit/person_notifier_test.rb b/test/unit/person_notifier_test.rb
index dac964e..76a9e7f 100644
--- a/test/unit/person_notifier_test.rb
+++ b/test/unit/person_notifier_test.rb
@@ -243,7 +243,7 @@ class PersonNotifierTest < ActiveSupport::TestCase
     notify
     sent = ActionMailer::Base.deliveries.last
     assert_match /src="\/\/www.gravatar.com\/avatar.*"/, sent.body.to_s
-    assert_match /src="http:\/\/colivre.net\/images\/icons-app\/community-icon.png.*"/, sent.body.to_s
+    assert_match /src="\/\/localhost\/images\/icons-app\/community-icon.png.*"/, sent.body.to_s
   end
 
   should 'list tasks in notification mail' do
--
libgit2 0.21.2