diff --git a/app/models/hyrax/file_metadata.rb b/app/models/hyrax/file_metadata.rb
index c679164e97..d521ae8418 100644
--- a/app/models/hyrax/file_metadata.rb
+++ b/app/models/hyrax/file_metadata.rb
@@ -67,7 +67,7 @@ def uri_for(use:)
     attribute :label, ::Valkyrie::Types::Set
     attribute :original_filename, ::Valkyrie::Types::String
     attribute :mime_type, ::Valkyrie::Types::String.default(GENERIC_MIME_TYPE)
-    attribute :type, ::Valkyrie::Types::Set.default([Use::ORIGINAL_FILE])
+    attribute :type, ::Valkyrie::Types::Set.default([Use::ORIGINAL_FILE].freeze) # Use += to add types, not <<
 
     # attributes set by fits
     attribute :format_label, ::Valkyrie::Types::Set
diff --git a/app/services/hyrax/valkyrie_upload.rb b/app/services/hyrax/valkyrie_upload.rb
index 3c9fa4cc86..ea9240f679 100644
--- a/app/services/hyrax/valkyrie_upload.rb
+++ b/app/services/hyrax/valkyrie_upload.rb
@@ -38,7 +38,7 @@ def upload(filename:, file_set:, io:, use: Hyrax::FileMetadata::Use::ORIGINAL_FI
     streamfile = storage_adapter.upload(file: io, original_filename: filename, resource: file_set)
     file_metadata = Hyrax::FileMetadata(streamfile)
     file_metadata.file_set_id = file_set.id
-    file_metadata.type << use
+    file_metadata.type += [use]
 
     if use == Hyrax::FileMetadata::Use::ORIGINAL_FILE
       # Set file set label.