diff --git a/mappers/number.inc b/mappers/number.inc
index 338d569..4acb2bb 100644
--- a/mappers/number.inc
+++ b/mappers/number.inc
@@ -39,7 +39,7 @@ function number_feeds_processor_targets_alter(&$targets, $entity_type, $bundle_n
  */
 function number_feeds_set_target($source, $entity, $target, array $values) {
   // Iterate over all values.
-  $field = isset($entity->$target) ? $entity->$target : array('und' => array());
+  $field = isset($entity->$target) ? $entity->$target : array(LANGUAGE_NONE => array());
 
   foreach ($values as $value) {
 
@@ -47,8 +47,14 @@ function number_feeds_set_target($source, $entity, $target, array $values) {
       $value = $value->getValue();
     }
 
+    // Booleans aren't numeric, so cast them.
+    if (is_bool($value)) {
+      $field[LANGUAGE_NONE][] = array('value' => $value);
+      continue;
+    }
+
     if (is_numeric($value)) {
-      $field['und'][] = array('value' => $value);
+      $field[LANGUAGE_NONE][] = array('value' => $value);
     }
   }