diff --git a/date.migrate.inc b/date.migrate.inc
index ad2a568..90c1ec5 100644
--- a/date.migrate.inc
+++ b/date.migrate.inc
@@ -1,10 +1,13 @@
 <?php
-
 /**
  * @file
  * Support for migration into Date fields.
  */
 
+if (!class_exists('MigrateFieldHandler')) {
+  return;
+}
+
 /**
  * Implements hook_migrate_api().
  */