diff --git a/mod/assignment/mod.html b/mod/assignment/mod.html
index d0486f1b9d9..5837c09238b 100644
--- a/mod/assignment/mod.html
+++ b/mod/assignment/mod.html
@@ -92,7 +92,7 @@
             $form->maxbytes = get_real_size("500K");
         }
         ksort($filesize, SORT_NUMERIC);
-        choose_from_menu($filesize, "maxbytes", "$form->maxbytes");
+        choose_from_menu($filesize, "maxbytes", "$form->maxbytes", "");
         ?>
     </td>
 </tr>