diff --git a/inline_entity_form.module b/inline_entity_form.module
index 2fa09b1..b13ff5e 100644
--- a/inline_entity_form.module
+++ b/inline_entity_form.module
@@ -478,6 +478,8 @@ function inline_entity_form_field_widget_form(&$form, &$form_state, $field, $ins
     }
   }

+  drupal_alter('inline_entity_form_widget_state', $form_state['inline_entity_form'][$ief_id], $form_state);
+
   // Build the appropriate widget.
   // The "Single value" widget assumes it is operating on a required single
   // value reference field with 1 allowed bundle.