diff --git a/system/database/DB_forge.php b/system/database/DB_forge.php
index 6bc40411b51..5db05c71504 100644
--- a/system/database/DB_forge.php
+++ b/system/database/DB_forge.php
@@ -97,16 +97,6 @@ function drop_database($db_name)
 	 */
 	function add_key($key = '', $primary = FALSE)
 	{
-		if (is_array($key))
-		{
-			foreach ($key as $one)
-			{
-				$this->add_key($one, $primary);
-			}
-
-			return;
-		}
-
 		if ($key == '')
 		{
 			show_error('Key information is required for that operation.');
@@ -379,4 +369,4 @@ function _reset()
 }
 
 /* End of file DB_forge.php */
-/* Location: ./system/database/DB_forge.php */
\ No newline at end of file
+/* Location: ./system/database/DB_forge.php */