diff --git a/system/core/Input.php b/system/core/Input.php
index 2a0c3d8..0809746 100644
--- a/system/core/Input.php
+++ b/system/core/Input.php
@@ -726,7 +726,7 @@ function _clean_input_data($str)
 	*/
 	function _clean_input_keys($str)
 	{
-		if ( ! preg_match("/^[~a-z0-9:_\/-\.]+$/i", $str))
+		if ( ! preg_match("/^[~a-z0-9:_\/-/.]+$/i", $str))
 		{
 			exit('Disallowed Key Characters.');
 		}