diff --git a/xmlsitemap.install b/xmlsitemap.install
index 2caaf0b..d7da6a4 100644
--- a/xmlsitemap.install
+++ b/xmlsitemap.install
@@ -9,6 +9,7 @@
 use Drupal\Core\Language\LanguageInterface;
 use Drupal\Core\Session\AnonymousUserSession;
 use Drupal\Core\Url;
+use Drupal\Core\Database\Database;
 
 /**
  * Implements hook_requirements().
@@ -168,12 +169,10 @@ function xmlsitemap_schema() {
     'fields' => array(
       'id' => array(
         'description' => 'Primary key with type; a unique id for the item.',
-        'type' => 'varchar',
-        'length' => 32,
+        'type' => 'int',
+        'unsigned' => TRUE,
         'not null' => TRUE,
-        'default' => '',
-      //'unsigned' => TRUE,
-      //'default' => 0,
+        'default' => 0,
       ),
       'type' => array(
         'description' => 'Primary key with id; the type of item (e.g. node, user, etc.).',
@@ -347,3 +346,12 @@ function xmlsitemap_uninstall() {
 function xmlsitemap_update_last_removed() {
   return 7203;
 }
+
+/**
+ * Change the `id` from `varchar` to `int`.
+ */
+function xmlsitemap_update_8003() {
+  $schema = Database::getConnection()->schema();
+  $schema->changeField('xmlsitemap', 'id', 'id',
+    ['type' => 'int', 'not null' => TRUE]);
+}