diff --git a/lib/functions.php b/lib/functions.php
index 73140ba..243ed2a 100644
--- a/lib/functions.php
+++ b/lib/functions.php
@@ -44,14 +44,7 @@ function make_anchor_link($url)
  */
 function is_external_url($url)
 {
-    $link_url = wp_parse_url($url);
-    $home_url = wp_parse_url(home_url());
-
-    if ($link_url['host'] === $home_url['host']) {
-        return false;
-    }
-
-    return true;
+    return wp_parse_url($url, PHP_URL_HOST) !== wp_parse_url(home_url(), PHP_URL_HOST);
 }
 
 /**