diff --git a/material/partials/header.html b/material/partials/header.html
index dc1bd0e38..07707ab14 100644
--- a/material/partials/header.html
+++ b/material/partials/header.html
@@ -3,7 +3,7 @@
 -#}
 {% set site_url = config.site_url | default(nav.homepage.url, true) | url %}
 {% if not config.use_directory_urls and site_url[0] == site_url[-1] == "." %}
-  {% set site_url = site_url ~ "/index.html" | url %}
+  {% set site_url = site_url ~ "/index.html" %}
 {% endif %}
 <header class="md-header" data-md-component="header">
   <nav class="md-header-nav md-grid" aria-label="{{ lang.t('header.title') }}">
diff --git a/src/partials/header.html b/src/partials/header.html
index 953dfb976..ecc8f88ae 100644
--- a/src/partials/header.html
+++ b/src/partials/header.html
@@ -23,7 +23,7 @@
 <!-- Mitigate bug: https://github.com/mkdocs/mkdocs/issues/2191 -->
 {% set site_url = config.site_url | default(nav.homepage.url, true) | url %}
 {% if not config.use_directory_urls and site_url[0] == site_url[-1] == "." %}
-  {% set site_url = site_url ~ "/index.html" | url %}
+  {% set site_url = site_url ~ "/index.html" %}
 {% endif %}
 
 <!-- Application header -->