diff --git a/application/libraries/datamapper.php b/application/libraries/datamapper.php
index 5950971..2f320dc 100644
--- a/application/libraries/datamapper.php
+++ b/application/libraries/datamapper.php
@@ -5962,7 +5962,7 @@ protected function _valid_match($field, $param = array())
 	 */
 	protected function _boolean($field)
 	{
-		$this->{$field} = (boolean)$this->{$field};
+		$this->{$field} = (bool)$this->{$field};
 	}
 
 	// --------------------------------------------------------------------