diff --git a/tests/notification/base.php b/tests/notification/base.php
index ab92f88262..3560ac6fcd 100644
--- a/tests/notification/base.php
+++ b/tests/notification/base.php
@@ -96,6 +96,15 @@ abstract class phpbb_tests_notification_base extends phpbb_database_test_case
 		$this->notifications->set_var('notification_types', $types);
 	}
 
+	protected function tearDown()
+	{
+		$this->db->sql_query('DELETE FROM phpbb_notification_types');
+		$this->db->sql_query('DELETE FROM phpbb_notifications');
+		$this->db->sql_query('DELETE FROM phpbb_user_notifications');
+
+		parent::tearDown();
+	}
+
 	protected function build_type($type)
 	{
 		global $phpbb_root_path, $phpEx;