diff --git a/config.yml b/config.yml
index 9baad4e..e46359e 100644
--- a/config.yml
+++ b/config.yml
@@ -23,7 +23,7 @@ params:
         title: lordthanwer@gmail.com
       - class: phone
         icon: fa-phone
-        url: tel:+4915755717702
+        url: 'tel:+4915755717702'
         title: +49 15755717702
       - class: telegram
         icon: fa-paper-plane