diff --git a/pkg/objstore/prefixed_bucket.go b/pkg/objstore/prefixed_bucket.go
index 446cc2f60e4..59298be97e2 100644
--- a/pkg/objstore/prefixed_bucket.go
+++ b/pkg/objstore/prefixed_bucket.go
@@ -1,3 +1,6 @@
+// Copyright (c) The Thanos Authors.
+// Licensed under the Apache License 2.0.
+
 package objstore
 
 import (
diff --git a/pkg/objstore/prefixed_bucket_test.go b/pkg/objstore/prefixed_bucket_test.go
index f705153ae41..c41a73b067a 100644
--- a/pkg/objstore/prefixed_bucket_test.go
+++ b/pkg/objstore/prefixed_bucket_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) The Thanos Authors.
+// Licensed under the Apache License 2.0.
+
 package objstore
 
 import (