diff --git a/mod/assignment/upload.php b/mod/assignment/upload.php
index 4a6dc8214a1..0ed3becc56c 100644
--- a/mod/assignment/upload.php
+++ b/mod/assignment/upload.php
@@ -51,6 +51,7 @@
                     assignment_delete_user_files($assignment, $USER, $newfile_name);
                     if ($submission) {
                         $submission->timemodified = time();
+                        $submission->numfiles     = 1;
                         if (update_record("assignment_submissions", $submission)) {
                             print_heading(get_string("uploadsuccess", "assignment", $newfile_name) );
                         } else {