diff --git a/src/Names.php b/src/Names.php
index 096d781..b4cab6d 100644
--- a/src/Names.php
+++ b/src/Names.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace ArchTech\Enums;
 
 trait Names
diff --git a/src/Values.php b/src/Values.php
index 70edfd6..1b5f0c7 100644
--- a/src/Values.php
+++ b/src/Values.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace ArchTech\Enums;
 
 trait Values