diff --git a/drupal_web_test_case.php b/drupal_web_test_case.php
index ec11ca3..7d118a6 100644
--- a/drupal_web_test_case.php
+++ b/drupal_web_test_case.php
@@ -3422,6 +3422,11 @@ class DrupalWebTestCase extends DrupalTestCase {
  * Clone an existing database and use it for testing.
  */
 class DrupalCloneTestCase extends DrupalWebTestCase {
+  /**
+   * Information about existing database tables.
+   */
+  protected $sources = array();
+  protected $schemas = array();
 
   /**
    * Tables to exlude during data cloning, only their structure will be cloned.
@@ -3442,28 +3447,23 @@ class DrupalCloneTestCase extends DrupalWebTestCase {
     'cache_update',
     'watchdog',
   );
-
-  protected function setUpInstall(array $modules, $public_files_directory, $private_files_directory, $temp_files_directory) {
-    global $db_prefix;
-
-    // Store new database prefix.
-    $db_prefix_new = $db_prefix;
-    $db_prefix = $this->originalPrefix;
-
+  protected function setUp() {
     // Rebuild schema based on prefixed database and such.
-    $schemas = drupal_get_schema(NULL, TRUE);
+    $this->schemas = drupal_get_schema(NULL, TRUE);
+
     // Create a list of prefixed source table names.
-    $sources = array();
-    foreach ($schemas as $name => $schema) {
-      $sources[$name] = Database::getConnection()->prefixTables('{' . $name . '}');
+    $this->sources = array();
+    foreach ($this->schemas as $name => $schema) {
+      $this->sources[$name] = Database::getConnection()->prefixTables('{' . $name . '}');
     }
 
-    // Return to new prefix before performing cloning.
-    $db_prefix = $db_prefix_new;
+    parent::setUp();
+  }
 
+  protected function setUpInstall(array $modules, $public_files_directory, $private_files_directory, $temp_files_directory) {
     // Clone each table into the new database.
-    foreach ($schemas as $name => $schema) {
-      $this->cloneTable($name, $sources[$name], $schema);
+    foreach ($this->schemas as $name => $schema) {
+      $this->cloneTable($name, $this->sources[$name], $schema);
     }
   }