diff --git a/lib/tasks/dspace_exporter.rake b/lib/tasks/dspace_exporter.rake
index dc2baaa..a9fd095 100644
--- a/lib/tasks/dspace_exporter.rake
+++ b/lib/tasks/dspace_exporter.rake
@@ -153,7 +153,7 @@ namespace :dspace do
     end
 
     unless ENV["PRIMARY_FILES_ONLY"] == "true"
-      thesis.documents.supplemental.not_deleted.each do |document|
+      thesis.documents.supplemental.not_deleted.where(usage: :thesis).each do |document|
         log "       #{document.file.path}"
         files.push document.file.path
       end