diff --git a/system/core/Input.php b/system/core/Input.php
index 142e2b4..c0158df 100644
--- a/system/core/Input.php
+++ b/system/core/Input.php
@@ -691,7 +691,7 @@
 	 */
 	protected function _clean_input_keys($str)
 	{
-		if ( ! preg_match('/^[a-z0-9:_\/-]+$/i', $str))
+		if ( ! preg_match('/^[a-z0-9:_\/|-]+$/i', $str))
 		{
 			set_status_header(503);
 			exit('Disallowed Key Characters.');