diff --git a/src/ServerConfigGroup.php b/src/ServerConfigGroup.php
index 37df7e9a7..f69990cf8 100644
--- a/src/ServerConfigGroup.php
+++ b/src/ServerConfigGroup.php
@@ -27,6 +27,8 @@ use pocketmine\utils\Config;
 use function array_key_exists;
 use function getopt;
 use function is_bool;
+use function is_int;
+use function is_string;
 use function strtolower;
 
 final class ServerConfigGroup{