diff --git a/src/Sql/Type.php b/src/Sql/Type.php
index b998f7a..52af57b 100644
--- a/src/Sql/Type.php
+++ b/src/Sql/Type.php
@@ -4,6 +4,7 @@
 
 namespace SimPod\ClickHouseClient\Sql;
 
+use function assert;
 use function preg_match;
 
 final readonly class Type
@@ -14,7 +15,8 @@ private function __construct(public string $name, public string $params)
 
     public static function fromString(string $type): self
     {
-        preg_match('~([a-zA-Z\d ]+)(?:\((.+)\))?~', $type, $matches);
+        $result = preg_match('~([a-zA-Z\d ]+)(?:\((.+)\))?~', $type, $matches);
+        assert($result === 1);
 
         return new self($matches[1], $matches[2] ?? '');
     }