diff --git a/composer.json b/composer.json
index 702b1d6..eb879f6 100644
--- a/composer.json
+++ b/composer.json
@@ -26,6 +26,6 @@
     "require": {
     },
     "require-dev": {
-        "phpunit/phpunit": "^4.8 || ^5.7 || ^6.5 || ^7.5"
+        "phpunit/phpunit": "^4.8 || ^5.7 || ^6.5 || ^7.5 || ^8.0"
     }
 }
diff --git a/src/With.php b/src/With.php
index 71bb294..771d25b 100644
--- a/src/With.php
+++ b/src/With.php
@@ -41,7 +41,7 @@ public function __construct($thing)
      *
      * @return With
      */
-    public function __call(string $method, array $things): With
+    public function __call(string $method, array $things)
     {
         if (\substr($method, -1) === '_') {
             $method   = \substr($method, 0, -1);