diff --git a/simplewiki.module b/simplewiki.module
index 04d1ea3..ce2310b 100644
--- a/simplewiki.module
+++ b/simplewiki.module
@@ -39,11 +39,14 @@ function simplewiki_filter_info() {
 
 function _filter_simplewiki_settings($form, &$form_state, $filter, $format, $defaults) {
   $filter->settings += $defaults;
+  // Default autotoc to uncheck when creating a new filter
+  $autotoc = isset($filter->settings['autotoc']) ? $filter->settings['autotoc'] : 0;
+  
   $elements = array();
   $elements['autotoc'] = array(
     '#type' => 'checkbox', 
     '#title' => t('Automatically generate Table of Contents'), 
-    '#default_value' => $filter->settings['autotoc'],
+    '#default_value' => $autotoc,
   );
   return $elements;
 }