diff --git a/core/lib/Drupal/Core/Path/PathMatcher.php b/core/lib/Drupal/Core/Path/PathMatcher.php
index be55668..95c56dd 100644
--- a/core/lib/Drupal/Core/Path/PathMatcher.php
+++ b/core/lib/Drupal/Core/Path/PathMatcher.php
@@ -19,7 +19,7 @@ class PathMatcher implements PathMatcherInterface {
    *
    * @var bool
    */
-  protected $isCurrentFrontPage = FALSE;
+  protected $isCurrentFrontPage;
 
   /**
    * The default front page.
@@ -83,7 +83,7 @@ public function matchPath($path, $patterns) {
    */
   public function isFrontPage() {
     // Cache the result as this is called often.
-    if (!$this->isCurrentFrontPage) {
+    if (!isset($this->isCurrentFrontPage)) {
       $this->isCurrentFrontPage = (current_path() == $this->getFrontPagePath());
     }
     return $this->isCurrentFrontPage;