diff --git a/src/Cision.php b/src/Cision.php
index 3618344..bbdf5e9 100755
--- a/src/Cision.php
+++ b/src/Cision.php
@@ -15,7 +15,7 @@ class Cision
     /**
      * Constructor that accepts a slug identifier for the feed.
      */
-    public function __construct(?string $slug = null)
+    public function __construct(string $slug)
     {
         $this->slug = $slug;
     }
diff --git a/tests/CisionTest.php b/tests/CisionTest.php
index da78677..c4f67aa 100644
--- a/tests/CisionTest.php
+++ b/tests/CisionTest.php
@@ -24,7 +24,7 @@ it('can fetch and parse full article content', function () {
         'news.cision.com/*' => Http::response(file_get_contents(__DIR__.'/Fixtures/article.html')),
     ]);
 
-    $cision = new Cision;
+    $cision = new Cision('test-company');
     $content = $cision->fetchContent('https://news.cision.com/se/example/r/test,c123456');
 
     expect($content)->toHaveKeys(['header', 'published_at', 'content']);