diff --git a/src/Symfony/Component/VarExporter/ProxyHelper.php b/src/Symfony/Component/VarExporter/ProxyHelper.php
index 538d23f7c5087..e3a38b14a139b 100644
--- a/src/Symfony/Component/VarExporter/ProxyHelper.php
+++ b/src/Symfony/Component/VarExporter/ProxyHelper.php
@@ -79,7 +79,9 @@ public static function generateLazyGhost(\ReflectionClass $class): string
             $hooks .= "\n    "
                 .($p->isProtected() ? 'protected' : 'public')
                 .($p->isProtectedSet() ? ' protected(set)' : '')
-                ." {$type} \${$name} {\n";
+                ." {$type} \${$name}"
+                .($p->hasDefaultValue() ? ' = '.$p->getDefaultValue() : '')
+                ." {\n";
 
             foreach ($p->getHooks() as $hook => $method) {
                 if ('get' === $hook) {