diff --git a/uninstall.php b/uninstall.php
index b4975181..0ef1824d 100644
--- a/uninstall.php
+++ b/uninstall.php
@@ -10,4 +10,5 @@
 defined( 'WP_UNINSTALL_PLUGIN' ) or die;
 
 delete_option( 'preferred_languages' );
+delete_site_option( 'preferred_languages' );
 delete_metadata( 'user', null, 'preferred_languages', '', true );