diff --git a/CHANGELOG.md b/CHANGELOG.md
index 80ac64f..1956f2d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,5 @@
 ### 6.4.0: May 1st, 2013
+* Fix relative external URLs issue
 * Fix Theme Activation page issues
 * Fix issues with root relative URLs and rewrites on non-standard setups
 * Make sure rewrites are added to .htaccess immediately after activation
diff --git a/lib/cleanup.php b/lib/cleanup.php
index 1b0d369..3b50a70 100644
--- a/lib/cleanup.php
+++ b/lib/cleanup.php
@@ -138,8 +138,16 @@ add_filter('body_class', 'roots_body_class');
  * @author Scott Walkinshaw <scott.walkinshaw@gmail.com>
  */
 function roots_root_relative_url($input) {
-  $output = wp_make_link_relative($input);
-  return $output;
+  $parsed_url  = parse_url(site_url());
+  $site_domain = $parsed_url['host'];
+
+  preg_match('|https?://([^/]+)(/.*)|i', $input, $matches);
+
+  if (isset($matches[1]) && isset($matches[2]) && $matches[1] === $site_domain) {
+    return wp_make_link_relative($input);
+  } else {
+    return $input;
+  }
 }
 
 function roots_enable_root_relative_urls() {
@@ -152,7 +160,7 @@ if (roots_enable_root_relative_urls()) {
     'the_permalink',
     'wp_list_pages',
     'wp_list_categories',
-    'wp_nav_menu',
+    'roots_wp_nav_menu_item',
     'the_content_more_link',
     'the_tags',
     'get_pagenum_link',
diff --git a/lib/nav.php b/lib/nav.php
index 3ce0314..8a071b1 100644
--- a/lib/nav.php
+++ b/lib/nav.php
@@ -34,6 +34,7 @@ class Roots_Nav_Walker extends Walker_Nav_Menu {
       $item_html = preg_replace('/<a[^>]*>(.*)<\/a>/iU', '$1', $item_html);
     }
 
+    $item_html = apply_filters('roots_wp_nav_menu_item', $item_html);
     $output .= $item_html;
   }