diff --git a/phone.migrate.inc b/phone.migrate.inc
index 2523ce0..d6aaedd 100644
--- a/phone.migrate.inc
+++ b/phone.migrate.inc
@@ -5,9 +5,15 @@
  * on behalf of the former phone module, moved into a separate file for efficiency.
  */
 
+// Avoid issues when migrate module is disabled.
+if (!class_exists('MigrateSimpleFieldHandler')) {
+  return;
+}
+
+
 /**
  * Implements hook_content_migrate_field_alter().
- * 
+ *
  * Use this to tweak the conversion of field settings
  * from the D6 style to the D7 style for specific
  * situations not handled by basic conversion,