diff --git includes/install.inc includes/install.inc
index 68a67bc..f75a75d 100644
--- includes/install.inc
+++ includes/install.inc
@@ -307,6 +307,14 @@ abstract class DatabaseTasks {
     ),
     array(
       'arguments'   => array(
+        'CREATE CLUSTERED INDEX {drupal_install_test_idx} ON {drupal_install_test} (id)',
+        'Can create clustered index.',
+        'Failed to <strong>CREATE</strong> a clustered index on your database server with the command %query. The server reports the following message: %error.<p>Are you sure the configured username has the necessary permissions to create tables in the database?</p>',
+        TRUE,
+      ),
+    ),
+    array(
+      'arguments'   => array(
         'INSERT INTO {drupal_install_test} (id) VALUES (1)',
         'Drupal can use INSERT database commands.',
         'Failed to <strong>INSERT</strong> a value into a test table on your database server. We tried inserting a value with the command %query and the server reported the following error: %error.',
@@ -548,7 +556,7 @@ abstract class DatabaseTasks {
    *
    * @param $database
    *   An array of driver specific configuration options.
-   * 
+   *
    * @return
    *   An array of driver configuration errors, keyed by form element name.
    */