diff --git a/src/CacheEntry.php b/src/CacheEntry.php
index e82dab76..127c1c6e 100644
--- a/src/CacheEntry.php
+++ b/src/CacheEntry.php
@@ -9,6 +9,7 @@
 namespace Kevinrob\GuzzleCache;
 
 
+use GuzzleHttp\Psr7\Stream;
 use Psr\Http\Message\ResponseInterface;
 
 class CacheEntry
@@ -19,6 +20,11 @@ class CacheEntry
      */
     protected $response;
 
+    /**
+     * @var string
+     */
+    protected $responseBody;
+
     /**
      * @var \DateTime
      */
@@ -148,4 +154,25 @@ public function hasValidationInformation()
         return $this->response->hasHeader("Etag") || $this->response->hasHeader("Last-Modified");
     }
 
+    public function __sleep()
+    {
+        if ($this->response !== null) {
+            $this->responseBody = (string)$this->response->getBody();
+        }
+
+        return array_keys(get_object_vars($this));
+    }
+
+    public function __wakeup()
+    {
+        if ($this->response !== null) {
+            $stream = fopen('php://memory','r+');
+            fwrite($stream, $this->responseBody);
+            rewind($stream);
+
+            $this->response = $this->response
+                ->withBody(new Stream($stream));
+        }
+    }
+
 }
diff --git a/src/PrivateCache.php b/src/PrivateCache.php
index 93273bee..2768d680 100644
--- a/src/PrivateCache.php
+++ b/src/PrivateCache.php
@@ -47,7 +47,6 @@ protected function getCacheObject(ResponseInterface $response)
                 return $entry->hasValidationInformation() ? $entry : null;
             }
 
-            $matches = [];
             foreach ($cacheControlDirectives as $directive) {
                 $matches = [];
                 if (preg_match('/^max-age=([0-9]*)$/', $directive, $matches)) {
@@ -87,7 +86,7 @@ protected function getCacheKey(RequestInterface $request)
     public function fetch(RequestInterface $request)
     {
         try {
-            return $this->storage->fetch($this->getCacheKey($request));
+            return unserialize($this->storage->fetch($this->getCacheKey($request)));
         } catch (\Exception $ignored) {
             return null;
         }
@@ -101,7 +100,7 @@ public function fetch(RequestInterface $request)
     public function cache(RequestInterface $request, ResponseInterface $response)
     {
         try {
-            return $this->storage->save($this->getCacheKey($request), $this->getCacheObject($response));
+            return $this->storage->save($this->getCacheKey($request), serialize($this->getCacheObject($response)));
         } catch (\Exception $ignored) {
             return false;
         }