diff --git a/src/SiteTypeManager.php b/src/SiteTypeManager.php
index b4edb8d..0922cb7 100644
--- a/src/SiteTypeManager.php
+++ b/src/SiteTypeManager.php
@@ -80,7 +80,7 @@ public function getSiteTypes() {
   /**
    * {@inheritdoc}
    */
-  public function getContentTypes():array {
+  public function getContentTypes(): array {
     /** @var \Drupal\node\NodeTypeInterface[] $types */
     $types = &drupal_static(__FUNCTION__, []);