diff --git a/src/wp-admin/includes/class-wp-filesystem-ftpext.php b/src/wp-admin/includes/class-wp-filesystem-ftpext.php
index 0ab4bc17c32a2..f640debc3044a 100644
--- a/src/wp-admin/includes/class-wp-filesystem-ftpext.php
+++ b/src/wp-admin/includes/class-wp-filesystem-ftpext.php
@@ -28,7 +28,7 @@ class WP_Filesystem_FTPext extends WP_Filesystem_Base {
 	 *
 	 * @param array $opt
 	 */
-	public function __construct( $opt = '' ) {
+	public function __construct( $opt = array() ) {
 		$this->method = 'ftpext';
 		$this->errors = new WP_Error();
 
diff --git a/src/wp-admin/includes/class-wp-filesystem-ssh2.php b/src/wp-admin/includes/class-wp-filesystem-ssh2.php
index 9146045025942..a26d4f7c6b41e 100644
--- a/src/wp-admin/includes/class-wp-filesystem-ssh2.php
+++ b/src/wp-admin/includes/class-wp-filesystem-ssh2.php
@@ -60,7 +60,7 @@ class WP_Filesystem_SSH2 extends WP_Filesystem_Base {
 	 *
 	 * @param array $opt
 	 */
-	public function __construct( $opt = '' ) {
+	public function __construct( $opt = array() ) {
 		$this->method = 'ssh2';
 		$this->errors = new WP_Error();