diff --git a/material/partials/language.html b/material/partials/language.html
index 7366121f9..bd0848751 100644
--- a/material/partials/language.html
+++ b/material/partials/language.html
@@ -1,6 +1,6 @@
 {#-
   This file was automatically generated - do not edit
 -#}
-{% import "partials/language/" + config.theme.language + ".html" as lang %}
+{% import "partials/language/" ~ config.theme.language ~ ".html" as lang %}
 {% import "partials/language/en.html" as fallback %}
 {% macro t(key) %}{{ lang.t(key) or fallback.t(key) }}{% endmacro %}
diff --git a/material/partials/nav-item.html b/material/partials/nav-item.html
index 82c821104..357e97f96 100644
--- a/material/partials/nav-item.html
+++ b/material/partials/nav-item.html
@@ -21,7 +21,7 @@
       <ul class="md-nav__list" data-md-scrollfix>
         {% set base = path %}
         {% for nav_item in nav_item.children %}
-          {% set path = base + "-" + loop.index | string %}
+          {% set path = base ~ "-" ~ loop.index %}
           {% set level = level + 1 %}
           {% include "partials/nav-item.html"  %}
         {% endfor %}
diff --git a/material/partials/nav.html b/material/partials/nav.html
index 2d4a0f804..1d6cef788 100644
--- a/material/partials/nav.html
+++ b/material/partials/nav.html
@@ -19,7 +19,7 @@
   {% endif %}
   <ul class="md-nav__list" data-md-scrollfix>
     {% for nav_item in nav %}
-      {% set path = "nav-" + loop.index | string %}
+      {% set path = "nav-" ~ loop.index %}
       {% set level = 1 %}
       {% include "partials/nav-item.html" %}
     {% endfor %}
diff --git a/src/partials/language.html b/src/partials/language.html
index 5d5e5efd8..2ef48e3ab 100644
--- a/src/partials/language.html
+++ b/src/partials/language.html
@@ -21,7 +21,7 @@
 -->
 
 <!-- Import translations for given language and fallback -->
-{% import "partials/language/" + config.theme.language + ".html" as lang %}
+{% import "partials/language/" ~ config.theme.language ~ ".html" as lang %}
 {% import "partials/language/en.html" as fallback %}
 
 <!-- Re-export translations -->
diff --git a/src/partials/nav-item.html b/src/partials/nav-item.html
index 700df2b95..35936d6cf 100644
--- a/src/partials/nav-item.html
+++ b/src/partials/nav-item.html
@@ -59,7 +59,7 @@
         <!-- Render nested item list -->
         {% set base = path %}
         {% for nav_item in nav_item.children %}
-          {% set path = base + "-" + loop.index | string %}
+          {% set path = base ~ "-" ~ loop.index %}
           {% set level = level + 1 %}
           {% include "partials/nav-item.html"  %}
         {% endfor %}
diff --git a/src/partials/nav.html b/src/partials/nav.html
index a9120f6f3..6c4825688 100644
--- a/src/partials/nav.html
+++ b/src/partials/nav.html
@@ -56,7 +56,7 @@
   <!-- Render item list -->
   <ul class="md-nav__list" data-md-scrollfix>
     {% for nav_item in nav %}
-      {% set path = "nav-" + loop.index | string %}
+      {% set path = "nav-" ~ loop.index %}
       {% set level = 1 %}
       {% include "partials/nav-item.html" %}
     {% endfor %}