diff --git a/src/Main.php b/src/Main.php
index 1b41738..7ebde14 100644
--- a/src/Main.php
+++ b/src/Main.php
@@ -419,7 +419,7 @@ final class Main implements RequestHandler
 
                     public function getApplicationLayerProtocols(): array
                     {
-                        return ["h2"];
+                        return ['h2'];
                     }
                 }
         );