diff --git a/lib/Doctrine/ORM/Proxy/ProxyFactory.php b/lib/Doctrine/ORM/Proxy/ProxyFactory.php
index 0660c423f0d..1e3f0cfbce0 100644
--- a/lib/Doctrine/ORM/Proxy/ProxyFactory.php
+++ b/lib/Doctrine/ORM/Proxy/ProxyFactory.php
@@ -432,8 +432,8 @@ private function getProxyFileName(string $className, string $baseDirectory): str
     {
         $baseDirectory = $baseDirectory ?: $this->proxyDir;
 
-        return rtrim($baseDirectory, DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR . InternalProxy::MARKER
-            . str_replace('\\', '', $className) . '.php';
+        return rtrim($baseDirectory, DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR . InternalProxy::MARKER . DIRECTORY_SEPARATOR
+            . str_replace('\\', DIRECTORY_SEPARATOR, $className) . '.php';
     }
 
     private function getProxyFactory(string $className): Closure
diff --git a/tests/Doctrine/Tests/ORM/Functional/ReferenceProxyTest.php b/tests/Doctrine/Tests/ORM/Functional/ReferenceProxyTest.php
index c0b147dfc56..12ff915c2f3 100644
--- a/tests/Doctrine/Tests/ORM/Functional/ReferenceProxyTest.php
+++ b/tests/Doctrine/Tests/ORM/Functional/ReferenceProxyTest.php
@@ -235,7 +235,8 @@ public function testCommonPersistenceProxy(): void
 
         $restName      = str_replace($this->_em->getConfiguration()->getProxyNamespace(), '', get_class($entity));
         $restName      = substr(get_class($entity), strlen($this->_em->getConfiguration()->getProxyNamespace()) + 1);
-        $proxyFileName = $this->_em->getConfiguration()->getProxyDir() . DIRECTORY_SEPARATOR . str_replace('\\', '', $restName) . '.php';
+        $separator     = $this->_em->getConfiguration()->isLazyGhostObjectEnabled() ? DIRECTORY_SEPARATOR : '';
+        $proxyFileName = $this->_em->getConfiguration()->getProxyDir() . DIRECTORY_SEPARATOR . str_replace('\\', $separator, $restName) . '.php';
         self::assertTrue(file_exists($proxyFileName), 'Proxy file name cannot be found generically.');
 
         $entity->__load();