diff --git a/system/drivers/DB_driver.php b/system/drivers/DB_driver.php
index 0c2084a..5fcb04a 100644
--- a/system/drivers/DB_driver.php
+++ b/system/drivers/DB_driver.php
@@ -352,7 +352,7 @@
 	 */	
 	function escape($str)
 	{	
-		if ( ! ctype_digit($str)) // bug fix to ensure that numbers are not treated as strings.
+		if ( ! is_numeric($str)) // bug fix to ensure that numbers are not treated as strings.
 		{
 			switch (gettype($str))
 			{