diff --git a/site/models/transaction.php b/site/models/transaction.php
index ca8738e..e86cd33 100644
--- a/site/models/transaction.php
+++ b/site/models/transaction.php
@@ -488,7 +488,7 @@ class Transaction extends AppModel {
       $assign_ops = array();
     elseif (is_array($control['assign']))
       $assign_ops = $control['assign'];
-    elseif (is_boolean($control['assign']))
+    elseif (is_bool($control['assign']))
       $assign_ops = array('assign', 'create');
     else
       $this->INTERNAL_ERROR('Invalid control[assign] parameter');