diff --git a/purl.module b/purl.module
index 21af314..c1dba40 100644
--- a/purl.module
+++ b/purl.module
@@ -786,7 +786,9 @@ function purl_custom_theme() {
   // Since menu_set_custom_theme() is invoked in the bootstrap before we had the
   // chance to restore the path it is unable to set the admin theme correctly.
   // This sets the admin theme from the normalized path.
-  if (user_access('view the administration theme') && path_is_admin(purl_get_normal_path(current_path()))) {
+  // The first permission check is for Drupal core, the second is for the
+  // admin_theme module.
+  if ((user_access('view the administration theme') || user_access('access admin theme')) && path_is_admin(purl_get_normal_path(current_path()))) {
     return variable_get('admin_theme');
   }
 }