diff --git a/src/Controller/OTP.php b/src/Controller/OTP.php
index e14821f..905b843 100644
--- a/src/Controller/OTP.php
+++ b/src/Controller/OTP.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace SimpleSAML\Module\cmdotcom\Controller;
 
 use GuzzleHttp\Client as GuzzleClient;
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index 7015240..1f72f27 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 $projectRoot = dirname(__DIR__);
 require_once($projectRoot . '/vendor/autoload.php');