diff --git a/link.migrate.inc b/link.migrate.inc
index fc8363f..bc4d203 100644
--- a/link.migrate.inc
+++ b/link.migrate.inc
@@ -1,5 +1,4 @@
 <?php
-
 /**
  * @file
  * Support for migrate module.
@@ -25,6 +24,10 @@
  * @endcode
  */
 
+if (!class_exists('MigrateFieldHandler')) {
+  return;
+}
+
 /**
  * Implements hook_migrate_api().
  */