diff --git a/lib/filesystem/FileType.php b/lib/filesystem/FileType.php
index 60bfa441eab99b36d475d4a751f73ce503b674d6..003ee856a9ac46120dd80214953526f61860a1b3 100644
--- a/lib/filesystem/FileType.php
+++ b/lib/filesystem/FileType.php
@@ -2,14 +2,6 @@
 
 interface FileType
 {
-    /**
-     * StandardFile constructor.
-     * @param $fileref
-     * @param null $file : (optional) Is set if fileref and file are both new and not connected with
-     *                     each other in the database.
-     */
-    public function __construct($fileref, $file = null);
-
     /**
      * Returns the name of the icon shape that shall be used with the FileType implementation.
      *
diff --git a/lib/filesystem/StandardFile.php b/lib/filesystem/StandardFile.php
index 3fe3672e723691029c7502d9157aa713da393219..5c9b5e8b76ea4c8812319c4084d4951a3231cd2b 100644
--- a/lib/filesystem/StandardFile.php
+++ b/lib/filesystem/StandardFile.php
@@ -12,7 +12,7 @@
  * @license   http://www.gnu.org/licenses/gpl-2.0.html GPL version 2
  * @category  Stud.IP
  */
-class StandardFile implements FileType, ArrayAccess
+class StandardFile implements FileType, ArrayAccess, StandardFileInterface
 {
 
     /**
diff --git a/lib/filesystem/StandardFileInterface.php b/lib/filesystem/StandardFileInterface.php
new file mode 100644
index 0000000000000000000000000000000000000000..a246550538c8d8e34d77972b1332a659b9782738
--- /dev/null
+++ b/lib/filesystem/StandardFileInterface.php
@@ -0,0 +1,11 @@
+<?php
+interface StandardFileInterface
+{
+    /**
+     * StandardFile constructor.
+     * @param $fileref
+     * @param null $file : (optional) Is set if fileref and file are both new and not connected with
+     *                     each other in the database.
+     */
+    public function __construct($fileref, $file = null);
+}
diff --git a/lib/filesystem/UnknownFileType.php b/lib/filesystem/UnknownFileType.php
index c8df875fe09e46cbf1dd9274868e212aeab2cd3a..effe75178de1083e10838c0fa7a509be711677e9 100644
--- a/lib/filesystem/UnknownFileType.php
+++ b/lib/filesystem/UnknownFileType.php
@@ -20,7 +20,7 @@ class UnknownFileType implements FileType, ArrayAccess
      */
     protected $fileref = null;
 
-    public function __construct($fileref = null, $file = null)
+    public function __construct($fileref = null)
     {
         $this->fileref = $fileref;
     }