diff --git a/src/Messages/SlackBlock.php b/src/Messages/SlackBlock.php
index 194d30d..a2be109 100644
--- a/src/Messages/SlackBlock.php
+++ b/src/Messages/SlackBlock.php
@@ -149,7 +149,7 @@ public function accessory($accessory)
      */
     public function url($url)
     {
-        $this->$url = $url;
+        $this->url = $url;
 
         return $this;
     }