diff --git a/templates/appointment.tera.html b/templates/appointment.tera.html
index 58ee914..47e4037 100644
--- a/templates/appointment.tera.html
+++ b/templates/appointment.tera.html
@@ -50,7 +50,7 @@
         </div>
     </div>
 
-    <iframe id="iframe" src="/contact-form" width="100%" title="Kontakt-Formular"></iframe>
+    <iframe id="iframe" src="{{ get_url(path='/contact-form') }}" width="100%" title="Kontakt-Formular"></iframe>
 
     <div class="alert alert-warning mt-2" role="alert">
         <h5 class="alert-heading">Bitte beachten Sie:</h5>