diff --git a/smartqueue.install b/smartqueue.install
index decd47b..9bd2385 100644
--- a/smartqueue.install
+++ b/smartqueue.install
@@ -45,28 +45,40 @@ function smartqueue_uninstall() {
   drupal_uninstall_schema('smartqueue');
 }
 
+/**
+ * Implementation of hook_update_N().
+ *
+ * Adds the smartqueue table.
+ */
 function smartqueue_update_6003() {
   $ret = array();
   // Don't use hook_schema for database updates per http://drupal.org/node/150220.
-  $schema = array(
-    'description' => t('Table for smartqueues, storing global information for each queue.'),
-    'fields' => array(
-      'qid' => array(
-        'description' => t('The primary identifier for a queue.'),
-        'type' => 'serial',
-        'unsigned' => TRUE,
-        'not null' => TRUE
+  // It's possible that users who installed the 2.7 or 2.8 versions of
+  // smartqueue will already have this table.
+  if (!db_table_exists('smartqueue')) {
+    $schema = array(
+      'description' => 'Table for smartqueues, storing global information for each queue.',
+      'fields' => array(
+        'qid' => array(
+          'description' => 'The primary identifier for a queue.',
+          'type' => 'serial',
+          'unsigned' => TRUE,
+          'not null' => TRUE,
+        ),
+        'use_parents' => array(
+          'description' => "Whether a queue is to use the terms' parents when displaying the queue selection.",
+          'type' => 'int',
+          'size' => 'tiny',
+          'default' => 0,
+        ),
       ),
-      'use_parents' => array(
-        'description' => t("Whether a queue is to use the terms' parents when displaying the queue selection."),
-        'type' => 'int',
-        'size' => 'tiny',
-        'default' => 0,
-      ),
-    ),
-    'primary key' => array('qid'),
-  );
-  db_create_table($ret, 'smartqueue', $schema);
-  $ret[] = update_sql('INSERT INTO {smartqueue} (qid) SELECT qid FROM {nodequeue_queue}');
+      'primary key' => array('qid'),
+    );
+    db_create_table($ret, 'smartqueue', $schema);
+  }
+  $result = db_query('SELECT q.qid FROM {nodequeue_queue} q LEFT JOIN {smartqueue} s ON q.qid = s.qid WHERE s.qid IS NULL');
+  while ($queue = db_fetch_object($result)) {
+    $ret[] = update_sql('INSERT INTO {smartqueue} (qid) VALUES (' . $queue->qid . ')');
+  }
   return $ret;
 }