diff --git a/src/Faker/Generator.php b/src/Faker/Generator.php
index 7c757c37..1db2608e 100644
--- a/src/Faker/Generator.php
+++ b/src/Faker/Generator.php
@@ -289,4 +289,9 @@ class Generator
     {
         $this->seed();
     }
+
+    public function __wakeup()
+    {
+        $this->formatters = [];
+    }
 }