diff --git a/lib/cleanup.php b/lib/cleanup.php
index 5c36e3e..eee2d6e 100644
--- a/lib/cleanup.php
+++ b/lib/cleanup.php
@@ -154,7 +154,7 @@ function roots_root_relative_url($input) {
 }
 
 function roots_enable_root_relative_urls() {
-  return !(is_admin() && in_array($GLOBALS['pagenow'], array('wp-login.php', 'wp-register.php'))) && current_theme_supports('root-relative-urls');
+  return !(is_admin() || in_array($GLOBALS['pagenow'], array('wp-login.php', 'wp-register.php'))) && current_theme_supports('root-relative-urls');
 }
 
 if (roots_enable_root_relative_urls()) {