diff --git a/FastRoute.hhi b/FastRoute.hhi
index c34bb8e..8d50738 100644
--- a/FastRoute.hhi
+++ b/FastRoute.hhi
@@ -34,21 +34,21 @@ namespace FastRoute {
     function simpleDispatcher(
         (function(RouteCollector): void) $routeDefinitionCallback,
         shape(
-          'routeParser' => ?classname<RouteParser>,
-          'dataGenerator' => ?classname<DataGenerator>,
-          'dispatcher' => ?classname<Dispatcher>,
-          'routeCollector' => ?classname<RouteCollector>,
+          ?'routeParser' => classname<RouteParser>,
+          ?'dataGenerator' => classname<DataGenerator>,
+          ?'dispatcher' => classname<Dispatcher>,
+          ?'routeCollector' => classname<RouteCollector>,
         ) $options = shape()): Dispatcher;
 
     function cachedDispatcher(
         (function(RouteCollector): void) $routeDefinitionCallback,
         shape(
-          'routeParser' => ?classname<RouteParser>,
-          'dataGenerator' => ?classname<DataGenerator>,
-          'dispatcher' => ?classname<Dispatcher>,
-          'routeCollector' => ?classname<RouteCollector>,
-          'cacheDisabled' => ?bool,
-          'cacheFile' => ?string,
+          ?'routeParser' => classname<RouteParser>,
+          ?'dataGenerator' => classname<DataGenerator>,
+          ?'dispatcher' => classname<Dispatcher>,
+          ?'routeCollector' => classname<RouteCollector>,
+          ?'cacheDisabled' => bool,
+          ?'cacheFile' => string,
         ) $options = shape()): Dispatcher;
 }