diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2db88ca2c..46aa635e8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,7 +8,7 @@
 1. [](#bugfix)
     * Fixed port issue with `system.custom_base_url`
     * Hide errors with `exif_read_data` in `ImageFile`
-    * Fixed unserialize in `MarkdownFormatter` class
+    * Fixed unserialize in `MarkdownFormatter` and `Framework\File` classes
 
 # v1.7.0-rc.20
 ## 12/15/2020
diff --git a/system/src/Grav/Framework/File/AbstractFile.php b/system/src/Grav/Framework/File/AbstractFile.php
index b4fc0ee88..452a3e976 100644
--- a/system/src/Grav/Framework/File/AbstractFile.php
+++ b/system/src/Grav/Framework/File/AbstractFile.php
@@ -11,6 +11,7 @@ declare(strict_types=1);
 
 namespace Grav\Framework\File;
 
+use Grav\Framework\Compat\Serializable;
 use Grav\Framework\File\Interfaces\FileInterface;
 use Grav\Framework\Filesystem\Filesystem;
 
@@ -20,6 +21,8 @@ use Grav\Framework\Filesystem\Filesystem;
  */
 class AbstractFile implements FileInterface
 {
+    use Serializable;
+
     /** @var Filesystem */
     private $filesystem;
     /** @var string */
@@ -67,20 +70,22 @@ class AbstractFile implements FileInterface
     }
 
     /**
-     * @return string
+     * @return array
      */
-    public function serialize(): string
+    final public function __serialize(): array
     {
-        return serialize($this->doSerialize());
+        return ['filesystem_normalize' => $this->filesystem->getNormalization()] + $this->doSerialize();
     }
 
     /**
-     * @param string $serialized
+     * @param array $data
      * @return void
      */
-    public function unserialize($serialized): void
+    final public function __unserialize(array $data): void
     {
-        $this->doUnserialize(unserialize($serialized, ['allowed_classes' => false]));
+        $this->filesystem = Filesystem::getInstance($data['filesystem_normalize'] ?? null);
+
+        $this->doUnserialize($data);
     }
 
     /**
diff --git a/system/src/Grav/Framework/Filesystem/Filesystem.php b/system/src/Grav/Framework/Filesystem/Filesystem.php
index b272b9446..a898f6d62 100644
--- a/system/src/Grav/Framework/Filesystem/Filesystem.php
+++ b/system/src/Grav/Framework/Filesystem/Filesystem.php
@@ -78,6 +78,14 @@ class Filesystem implements FilesystemInterface
         return static::getInstance($normalize);
     }
 
+    /**
+     * @return bool|null
+     */
+    public function getNormalization(): ?bool
+    {
+        return $this->normalize;
+    }
+
     /**
      * Force all paths to be normalized.
      *