diff --git a/roles/mailman3/tasks/main.yml b/roles/mailman3/tasks/main.yml
index 4c09f8f3fa..2e61dd8c66 100644
--- a/roles/mailman3/tasks/main.yml
+++ b/roles/mailman3/tasks/main.yml
@@ -20,7 +20,7 @@
     - python3-mailman-web
     - python3-pylibmc
     - python3-psycopg2
-    - python3-whoosh
+    - python3-xapian-haystack
     - sassc
   tags:
     - packages
diff --git a/roles/mailman3/templates/settings.py.j2 b/roles/mailman3/templates/settings.py.j2
index 029f981533..5954ea4239 100644
--- a/roles/mailman3/templates/settings.py.j2
+++ b/roles/mailman3/templates/settings.py.j2
@@ -300,7 +300,7 @@ COMPRESS_OFFLINE = True
 #
 HAYSTACK_CONNECTIONS = {
     'default': {
-        'ENGINE': 'haystack.backends.whoosh_backend.WhooshEngine',
+        'ENGINE': 'xapian_backend.XapianEngine',
         'PATH': "{{ mailman_webui_basedir }}/fulltext_index",
     },
 }