diff --git a/core/modules/field/src/FieldUninstallValidator.php b/core/modules/field/src/FieldUninstallValidator.php
index 8b27ae3..51f8640 100644
--- a/core/modules/field/src/FieldUninstallValidator.php
+++ b/core/modules/field/src/FieldUninstallValidator.php
@@ -47,7 +47,7 @@ public function validate($module) {
       // remains no actual, non-deleted fields)
       $non_deleted = FALSE;
       foreach ($field_storages as $field_storage) {
-        if (empty($field_storage->deleted)) {
+        if (!$field_storage->isDeleted()) {
           $non_deleted = TRUE;
           break;
         }