diff --git modules/system/system.install modules/system/system.install
index 0a5665d..f4dacae 100644
--- modules/system/system.install
+++ modules/system/system.install
@@ -2085,10 +2085,10 @@ function system_update_7018() {
 }
 
 /**
- * Enable field module.
+ * Enable field and field_ui modules.
  */
 function system_update_7020() {
-  $module_list = array('field_sql_storage', 'field');
+  $module_list = array('field_sql_storage', 'field', 'field_ui');
   module_enable($module_list, FALSE);
 }