diff --git a/src/Item/Field.php b/src/Item/Field.php
index 6d69216..8580c59 100644
--- a/src/Item/Field.php
+++ b/src/Item/Field.php
@@ -391,7 +391,7 @@ class Field implements \IteratorAggregate, FieldInterface {
    * {@inheritdoc}
    */
   public function setType($type) {
-    if ($this->isTypeLocked()) {
+    if ($type != $this->type && $this->isTypeLocked()) {
       $args['%field'] = $this->getLabel();
       $args['%index'] = $this->getIndex()->label();
       throw new SearchApiException(new FormattableMarkup('Trying to change the type of field %field on index %index, which is locked.', $args));