diff --git a/duplicity-backup.sh b/duplicity-backup.sh
index 3123510..95269f4 100755
--- a/duplicity-backup.sh
+++ b/duplicity-backup.sh
@@ -394,7 +394,7 @@ get_remote_file_size()
       fi
     ;;
     *)
-      SIZE="Information on remote file size unavailable."
+      SIZE="unsupported by backend"
     ;;
   esac