diff --git a/flag.module b/flag.module
index 377bb47..df991a1 100644
--- a/flag.module
+++ b/flag.module
@@ -448,8 +448,12 @@ function flag_form_alter(&$form, &$form_state, $form_id) {
 function flag_nodeapi(&$node, $op, $teaser = NULL, $page = NULL) {
   global $user;
   switch ($op) {
-    case 'update':
     case 'insert':
+      // Insert does not need to to unflag.
+      if (isset($node->flag)) {
+        $node->flag = array_filter($node->flag);
+      }
+    case 'update':
       // Response to the flag checkboxes added to the form in flag_form_alter().
       $remembered = FALSE;
       if (isset($node->flag)) {