diff --git a/src/Symfony/Bridge/Doctrine/SchemaListener/MessengerTransportDoctrineSchemaSubscriber.php b/src/Symfony/Bridge/Doctrine/SchemaListener/MessengerTransportDoctrineSchemaSubscriber.php
index 3311e6316825..5b3798eb3918 100644
--- a/src/Symfony/Bridge/Doctrine/SchemaListener/MessengerTransportDoctrineSchemaSubscriber.php
+++ b/src/Symfony/Bridge/Doctrine/SchemaListener/MessengerTransportDoctrineSchemaSubscriber.php
@@ -89,9 +89,16 @@ public function onSchemaCreateTable(SchemaCreateTableEventArgs $event): void
 
     public function getSubscribedEvents(): array
     {
-        return [
-            ToolEvents::postGenerateSchema,
-            Events::onSchemaCreateTable,
-        ];
+        $subscribedEvents = [];
+
+        if (class_exists(ToolEvents::class)) {
+            $subscribedEvents[] = ToolEvents::postGenerateSchema;
+        }
+
+        if (class_exists(Events::class)) {
+            $subscribedEvents[] = Events::onSchemaCreateTable;
+        }
+
+        return $subscribedEvents;
     }
 }
diff --git a/src/Symfony/Bridge/Doctrine/SchemaListener/PdoCacheAdapterDoctrineSchemaSubscriber.php b/src/Symfony/Bridge/Doctrine/SchemaListener/PdoCacheAdapterDoctrineSchemaSubscriber.php
index 41330e7971b5..527b055b2807 100644
--- a/src/Symfony/Bridge/Doctrine/SchemaListener/PdoCacheAdapterDoctrineSchemaSubscriber.php
+++ b/src/Symfony/Bridge/Doctrine/SchemaListener/PdoCacheAdapterDoctrineSchemaSubscriber.php
@@ -43,6 +43,10 @@ public function postGenerateSchema(GenerateSchemaEventArgs $event): void
 
     public function getSubscribedEvents(): array
     {
+        if (!class_exists(ToolEvents::class)) {
+            return [];
+        }
+
         return [
             ToolEvents::postGenerateSchema,
         ];