Index: plugins/content_types/nodecomment_form.inc
===================================================================
--- plugins/content_types/nodecomment_form.inc	(revision 23)
+++ plugins/content_types/nodecomment_form.inc	(working copy)
@@ -26,7 +26,7 @@
   }
   else if (module_exists('nodecomment') && !empty($node->node_comment)) {
     // find out what node type serves as the comment type for this node
-    $comment_type = variable_get('comment_type_'. $node->type, variable_get('default_comment_type', ''));
+    $comment_type = variable_get('node_comment_type_'. $node->type, variable_get('default_comment_type', ''));
     $comment_type_info = node_get_types('type', $comment_type);
     $block->title = t('Add @type', array('@type' => $comment_type_info->name));