diff --git a/utility.php b/utility.php
index 2d03633..7138443 100644
--- a/utility.php
+++ b/utility.php
@@ -318,5 +318,7 @@ function get_country_name(string $code): string {
         'ZA' => 'South Africa',
         'ZM' => 'Zambia',
         'ZW' => 'Zimbabwe',
+
+        default => 'Unknown',
     };
 }