diff --git a/src/flextype/Endpoints/Utils/access.php b/src/flextype/Endpoints/Utils/access.php
index 614c9434..5168f780 100644
--- a/src/flextype/Endpoints/Utils/access.php
+++ b/src/flextype/Endpoints/Utils/access.php
@@ -14,7 +14,7 @@ use function filesystem;
 /**
  * Validate access token
  */
-function validate_access_token($token): bool
+function validate_access_token(string $token): bool
 {
     return filesystem()->file(PATH['project'] . '/tokens/access/' . $token . '/token.yaml')->exists();
 }