diff --git a/functional_tests/features/mediawiki.feature b/functional_tests/features/mediawiki.feature
index 0f0bbb113..67affc179 100644
--- a/functional_tests/features/mediawiki.feature
+++ b/functional_tests/features/mediawiki.feature
@@ -86,7 +86,9 @@ Scenario: Upload SVG image
 Scenario: Backup and restore mediawiki
   Given the mediawiki application is enabled
   When I create a backup of the mediawiki app data
+  When I enable mediawiki public registrations
   And I delete the mediawiki main page
   And I export the mediawiki app data backup
   And I restore the mediawiki app data backup
   Then the mediawiki main page should be restored
+  Then the mediawiki site should allow creating accounts
diff --git a/plinth/modules/mediawiki/manifest.py b/plinth/modules/mediawiki/manifest.py
index 4c0e779a3..b6a58b890 100644
--- a/plinth/modules/mediawiki/manifest.py
+++ b/plinth/modules/mediawiki/manifest.py
@@ -29,6 +29,9 @@ clients = validate([{
 }])
 
 backup = validate_backup({
+    'config': {
+        'files': ['/etc/mediawiki/FreedomBoxSettings.php']
+    },
     'data': {
         'directories': ['/var/lib/mediawiki-db/']
     }