diff --git a/src/Symfony/Component/Form/Extension/DataCollector/FormDataCollector.php b/src/Symfony/Component/Form/Extension/DataCollector/FormDataCollector.php
index 88fa453a62..e7b485d39f 100644
--- a/src/Symfony/Component/Form/Extension/DataCollector/FormDataCollector.php
+++ b/src/Symfony/Component/Form/Extension/DataCollector/FormDataCollector.php
@@ -228,6 +228,9 @@ class FormDataCollector extends DataCollector implements FormDataCollectorInterf
         return $this->data;
     }
 
+    /**
+     * @internal
+     */
     public function serialize()
     {
         if ($this->hasVarDumper) {
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/DumpDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/DumpDataCollector.php
index 27197226de..e25e4fb37d 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/DumpDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/DumpDataCollector.php
@@ -176,6 +176,9 @@ class DumpDataCollector extends DataCollector implements DataDumperInterface
         $this->clonesIndex = 0;
     }
 
+    /**
+     * @internal
+     */
     public function serialize()
     {
         if ($this->clonesCount !== $this->clonesIndex) {
@@ -195,9 +198,12 @@ class DumpDataCollector extends DataCollector implements DataDumperInterface
         return $ser;
     }
 
+    /**
+     * @internal
+     */
     public function unserialize($data)
     {
-        parent::unserialize($data);
+        $this->data = unserialize($data);
         $charset = array_pop($this->data);
         $fileLinkFormat = array_pop($this->data);
         $this->dataCount = \count($this->data);