diff --git a/src/Choir/globals.php b/src/Choir/globals.php
index 3ebc3d6..35eddf1 100644
--- a/src/Choir/globals.php
+++ b/src/Choir/globals.php
@@ -1,3 +1,5 @@
 <?php
 
-const CHOIR_PSR_HTTP_VERSION = '1.0.0';
\ No newline at end of file
+declare(strict_types=1);
+
+const CHOIR_PSR_HTTP_VERSION = '1.0.0';