diff --git a/Layout/default/Voicenumberblock/Index.php b/Layout/default/Voicenumberblock/Index.php
index 8d693b739..3a31abbff 100644
--- a/Layout/default/Voicenumberblock/Index.php
+++ b/Layout/default/Voicenumberblock/Index.php
@@ -81,7 +81,7 @@
         <div class="card">
           <div class="card-body mb-3">
             <div class="row">
-              <div class="cols">
+              <div class="col-12">
                 <div class="float-left">
                   <h4 class="header-title">Rufnummernblöcke</h4>
                 </div>