diff --git a/src/Generation/FieldDetails.php b/src/Generation/FieldDetails.php
index 41adc4279..5d25124b4 100644
--- a/src/Generation/FieldDetails.php
+++ b/src/Generation/FieldDetails.php
@@ -101,6 +101,8 @@ class FieldDetails
     public ?int $oneOfIndex;
 
     private static $requiredToOptionalFixes = [
+        'google.bigtable.admin.v2.Cluster' => ['name', 'server_nodes'],
+        'google.bigtable.admin.v2.Instance' => ['name', 'type', 'labels'],
         'google.cloud.asset.v1.BatchGetAssetsHistoryRequest' => ['content_type', 'read_time_window'],
         'google.cloud.datacatalog.v1.SearchCatalogRequest' => ['query'],
         'google.datastore.v1.CommitRequest' => ['mode', 'mutations'],