diff --git a/src/flextype/Serializers/Neon.php b/src/flextype/Serializers/Neon.php
index 523ad01b..41406aa7 100644
--- a/src/flextype/Serializers/Neon.php
+++ b/src/flextype/Serializers/Neon.php
@@ -11,6 +11,7 @@ namespace Flextype\Serializers;
 
 use Nette\Neon\Exception;
 use Nette\Neon\Neon as NeonSerializer;
+use RuntimeException;
 
 use function cache;
 use function registry;