diff --git a/group_vars/all/15_about.yml b/group_vars/all/15_about.yml
index b61b6f8e..99594d31 100644
--- a/group_vars/all/15_about.yml
+++ b/group_vars/all/15_about.yml
@@ -21,7 +21,7 @@ defaults_service_provider:
          if 'web-app-bluesky' in group_names else '' }}
     email:          "{{ users.contact.username ~ '@' ~ PRIMARY_DOMAIN if 'web-app-mailu' in group_names else '' }}"
     mastodon:       "{{ '@' ~ users.contact.username ~ '@' ~ domains | get_domain('web-app-mastodon') if 'web-app-mastodon' in group_names else '' }}"
-    matrix:         "{{ '@' ~ users.contact.username ~ ':' ~ domains['web-app-matrix'].synapse if 'web-app-matrix' in group_names else '' }}"
+    matrix:         "{{ '@' ~ users.contact.username ~ ':' ~ applications | get_app_conf('web-app-matrix', 'server_name') if 'web-app-matrix' in group_names else '' }}"
     peertube:       "{{ '@' ~ users.contact.username ~ '@' ~ domains | get_domain('web-app-peertube') if 'web-app-peertube' in group_names else '' }}"
     pixelfed:       "{{ '@' ~ users.contact.username ~ '@' ~ domains | get_domain('web-app-pixelfed') if 'web-app-pixelfed' in group_names else '' }}"
     phone:          "+0 000 000 404"