diff --git a/src/Icon.php b/src/Icon.php
index 35be3ec..3315a3c 100644
--- a/src/Icon.php
+++ b/src/Icon.php
@@ -20,7 +20,7 @@ public function __construct($html)
 		}
 
 
-		public function __toString()
+		public function __toString(): string
 		{
 			return $this->html;
 		}