diff --git a/src/wp-admin/includes/class-wp-upgrader.php b/src/wp-admin/includes/class-wp-upgrader.php
index 6e525219b8..9487dc6cd4 100644
--- a/src/wp-admin/includes/class-wp-upgrader.php
+++ b/src/wp-admin/includes/class-wp-upgrader.php
@@ -141,7 +141,10 @@ class WP_Upgrader {
 	public function init() {
 		$this->skin->set_upgrader( $this );
 		$this->generic_strings();
-		$this->schedule_temp_backup_cleanup();
+
+		if ( ! wp_installing() ) {
+			$this->schedule_temp_backup_cleanup();
+		}
 	}
 
 	/**