diff --git a/system/router.php b/system/router.php
index 43571b354..1f16933e2 100644
--- a/system/router.php
+++ b/system/router.php
@@ -20,9 +20,7 @@ if (is_file($_SERVER['DOCUMENT_ROOT'] . DIRECTORY_SEPARATOR . $_SERVER['SCRIPT_N
 $grav_index = 'index.php';
 
 /* Check the GRAV_BASEDIR environment variable and use if set */
-$grav_basedir = getenv('GRAV_BASEDIR') ?: '';
-
-if (isset($grav_basedir)) {
+if ($grav_basedir = getenv('GRAV_BASEDIR') ?: '') {
     $grav_index = ltrim($grav_basedir, '/') . DIRECTORY_SEPARATOR . $grav_index;
     $grav_basedir = DIRECTORY_SEPARATOR . trim($grav_basedir, DIRECTORY_SEPARATOR);
     define('GRAV_ROOT', str_replace(DIRECTORY_SEPARATOR, '/', getcwd()) . $grav_basedir);