diff --git a/src/wp-admin/includes/class-plugin-upgrader.php b/src/wp-admin/includes/class-plugin-upgrader.php
index 53c7da1ced..a11fd1a1d9 100644
--- a/src/wp-admin/includes/class-plugin-upgrader.php
+++ b/src/wp-admin/includes/class-plugin-upgrader.php
@@ -127,6 +127,7 @@ class Plugin_Upgrader extends WP_Upgrader {
 		$this->install_strings();
 
 		add_filter( 'upgrader_source_selection', array( $this, 'check_package' ) );
+
 		if ( $parsed_args['clear_update_cache'] ) {
 			// Clear cache so wp_update_plugins() knows about the new plugin.
 			add_action( 'upgrader_process_complete', 'wp_clean_plugins_cache', 9, 0 );
diff --git a/src/wp-admin/includes/class-theme-upgrader.php b/src/wp-admin/includes/class-theme-upgrader.php
index a5901b9fc7..f087eb6281 100644
--- a/src/wp-admin/includes/class-theme-upgrader.php
+++ b/src/wp-admin/includes/class-theme-upgrader.php
@@ -239,6 +239,7 @@ class Theme_Upgrader extends WP_Upgrader {
 
 		add_filter( 'upgrader_source_selection', array( $this, 'check_package' ) );
 		add_filter( 'upgrader_post_install', array( $this, 'check_parent_theme_filter' ), 10, 3 );
+
 		if ( $parsed_args['clear_update_cache'] ) {
 			// Clear cache so wp_update_themes() knows about the new theme.
 			add_action( 'upgrader_process_complete', 'wp_clean_themes_cache', 9, 0 );
@@ -248,7 +249,7 @@ class Theme_Upgrader extends WP_Upgrader {
 			array(
 				'package'           => $package,
 				'destination'       => get_theme_root(),
-				'clear_destination' => $args['overwrite_package'],
+				'clear_destination' => $parsed_args['overwrite_package'],
 				'clear_working'     => true,
 				'hook_extra'        => array(
 					'type'   => 'theme',