diff --git a/php/elFinderVolumeDriver.class.php b/php/elFinderVolumeDriver.class.php
index 1ee8ad158..253a36b0b 100644
--- a/php/elFinderVolumeDriver.class.php
+++ b/php/elFinderVolumeDriver.class.php
@@ -13,6 +13,13 @@
  **/
 abstract class elFinderVolumeDriver {
 	
+	/**
+	 * Net mount key
+	 *
+	 * @var string
+	 **/
+	public $netMountKey = '';
+	
 	/**
 	 * Request args
 	 * $_POST or $_GET values
diff --git a/php/elFinderVolumeDropbox.class.php b/php/elFinderVolumeDropbox.class.php
index 034daad23..1b595cfa5 100644
--- a/php/elFinderVolumeDropbox.class.php
+++ b/php/elFinderVolumeDropbox.class.php
@@ -56,13 +56,6 @@ class elFinderVolumeDropbox extends elFinderVolumeDriver {
 	 **/
 	protected $tmp = '';
 	
-	/**
-	 * Net mount key
-	 *
-	 * @var string
-	 **/
-	public $netMountKey = '';
-	
 	/**
 	 * Dropbox.com uid
 	 *
diff --git a/php/elFinderVolumeFTP.class.php b/php/elFinderVolumeFTP.class.php
index ce5d268d2..d7c305376 100644
--- a/php/elFinderVolumeFTP.class.php
+++ b/php/elFinderVolumeFTP.class.php
@@ -55,13 +55,6 @@ class elFinderVolumeFTP extends elFinderVolumeDriver {
 	 **/
 	protected $tmp = '';
 	
-	/**
-	 * Net mount key
-	 *
-	 * @var string
-	 **/
-	public $netMountKey = '';
-	
 	/**
 	 * FTP command `MLST` support
 	 *