diff --git a/src/Feeds/Target/Boolean.php b/src/Feeds/Target/Boolean.php
index b172321..ed80325 100644
--- a/src/Feeds/Target/Boolean.php
+++ b/src/Feeds/Target/Boolean.php
@@ -21,7 +21,7 @@ class Boolean extends FieldTargetBase {
    * {@inheritdoc}
    */
   protected function prepareValue($delta, array &$values) {
-    $values['value'] = (bool) trim((string) $values['value']);
+    $values['value'] = (int) ((bool) trim((string) $values['value']));
   }
 
 }