diff --git a/modules/node/node.module b/modules/node/node.module
index f1ff4f0..556b32c 100644
--- a/modules/node/node.module
+++ b/modules/node/node.module
@@ -1005,7 +1005,7 @@ function node_search($op = 'search', $keys = NULL) {
 /**
  * Implementation of hook_user().
  */
-function node_user($op, $edit, &$user) {
+function node_user($op, &$edit, &$user) {
   if ($op == 'delete') {
     db_query('UPDATE {node} SET uid = 0 WHERE uid = %d', $user->uid);
     db_query('UPDATE {node_revisions} SET uid = 0 WHERE uid = %d', $user->uid);
diff --git a/modules/user/user.module b/modules/user/user.module
index 55bab38..a4ec5e1 100644
--- a/modules/user/user.module
+++ b/modules/user/user.module
@@ -463,7 +463,7 @@ function user_search($op = 'search', $keys = NULL) {
 /**
  * Implementation of hook_user().
  */
-function user_user($type, $edit, $user, $category = NULL) {
+function user_user($type, &$edit, $user, $category = NULL) {
   if ($type == 'view') {
     $items['history'] = array('title' => t('Member for'),
       'value' => format_interval(time() - $user->created),
diff --git a/modules/watchdog/watchdog.module b/modules/watchdog/watchdog.module
index e88b9e8..6c20844 100644
--- a/modules/watchdog/watchdog.module
+++ b/modules/watchdog/watchdog.module
@@ -72,7 +72,7 @@ function watchdog_cron() {
 /**
  * Implementation of hook_user().
  */
-function watchdog_user($op, $edit, $user) {
+function watchdog_user($op, &$edit, $user) {
   if ($op == 'delete') {
     db_query('UPDATE {watchdog} SET uid = 0 WHERE uid = %d', $user->uid);
   }