diff --git a/modules/salesforce_mapping_ui/src/Routing/RouteSubscriber.php b/modules/salesforce_mapping_ui/src/Routing/RouteSubscriber.php
index 5deb30a3e1ae343d3199b9d2a0512667a4829173..ea1964a3c460b0b89ce55a41940d7409ad196477 100644
--- a/modules/salesforce_mapping_ui/src/Routing/RouteSubscriber.php
+++ b/modules/salesforce_mapping_ui/src/Routing/RouteSubscriber.php
@@ -70,7 +70,7 @@ class RouteSubscriber extends RouteSubscriberBase {
   /**
    * {@inheritdoc}
    */
-  public static function getSubscribedEvents() {
+  public static function getSubscribedEvents(): array {
     $events = parent::getSubscribedEvents();
     $events[RoutingEvents::ALTER] = ['onAlterRoutes', 100];
     return $events;