diff --git a/core/lib/Drupal/Core/Controller/ControllerResolver.php b/core/lib/Drupal/Core/Controller/ControllerResolver.php
index ec64c1d89b03658f2b417e5a4fb07e9d28ddc9f1..73f0e6c6fca40cea686f5858a646ca39fdcdf094 100644
--- a/core/lib/Drupal/Core/Controller/ControllerResolver.php
+++ b/core/lib/Drupal/Core/Controller/ControllerResolver.php
@@ -78,7 +78,7 @@ public function getControllerFromDefinition($controller, $path = '') {
   /**
    * {@inheritdoc}
    */
-  public function getController(Request $request) {
+  public function getController(Request $request): callable|FALSE {
     if (!$controller = $request->attributes->get('_controller')) {
       return FALSE;
     }