diff --git a/webform.module b/webform.module
index 06bc06e..61dce73 100644
--- a/webform.module
+++ b/webform.module
@@ -2049,6 +2049,7 @@ function webform_node_view($node, $view_mode) {
       // user ID for this submission.
       if ($user->uid != 0 && $submission->uid != $user->uid) {
         $submission->uid = $user->uid;
+        $submission->session_id = session_id();
         // Save the submission now, so that the user ID is saved even if they
         // don't press 'save as draft' again.
         webform_submission_update($node, $submission);