diff --git a/docs/third_party/roundcube/third_party-roundcube.de.md b/docs/third_party/roundcube/third_party-roundcube.de.md
index be81ebdae..b48b765d7 100644
--- a/docs/third_party/roundcube/third_party-roundcube.de.md
+++ b/docs/third_party/roundcube/third_party-roundcube.de.md
@@ -228,7 +228,7 @@ Bearbeiten Sie `data/web/js/site/mailbox.js` und den folgenden Code nach [`if (A
 
 ```js
 if (ALLOW_ADMIN_EMAIL_LOGIN_ROUNDCUBE) {
-  item.action += '<a href="/rc-auth.php?login=' + encodeURIComponent(item.username) + '" class="login_as btn btn-xs ' + btn-xs-half + ' btn-primary" target="_blank"><i class="bi bi-envelope-fill"></i> Roundcube</a>';
+  item.action += '<a href="/rc-auth.php?login=' + encodeURIComponent(item.username) + '" class="login_as btn btn-xs ' + btnSize + ' btn-primary" target="_blank"><i class="bi bi-envelope-fill"></i> Roundcube</a>';
 }
 ```
 
diff --git a/docs/third_party/roundcube/third_party-roundcube.en.md b/docs/third_party/roundcube/third_party-roundcube.en.md
index 182befe17..9168f2e44 100644
--- a/docs/third_party/roundcube/third_party-roundcube.en.md
+++ b/docs/third_party/roundcube/third_party-roundcube.en.md
@@ -229,7 +229,7 @@ Edit `data/web/js/site/mailbox.js` and the following code after [`if (ALLOW_ADMI
 
 ```js
 if (ALLOW_ADMIN_EMAIL_LOGIN_ROUNDCUBE) {
-  item.action += '<a href="/rc-auth.php?login=' + encodeURIComponent(item.username) + '" class="login_as btn btn-xs ' + btn-xs-half + ' btn-primary" target="_blank"><i class="bi bi-envelope-fill"></i> Roundcube</a>';
+  item.action += '<a href="/rc-auth.php?login=' + encodeURIComponent(item.username) + '" class="login_as btn btn-xs ' + btnSize + ' btn-primary" target="_blank"><i class="bi bi-envelope-fill"></i> Roundcube</a>';
 }
 ```