diff --git a/material/base.html b/material/base.html
index be4e32990..7ccfc1ec4 100644
--- a/material/base.html
+++ b/material/base.html
@@ -182,19 +182,19 @@
         {% set languages = lang.t("search.language").split(",") %}
         {% if languages | length and languages[0] != "" %}
           {% set path = "/assets/javascripts/lunr/" %}
-          <script src="{{ path + 'lunr.stemmer.support.js' | url }}"></script>
+          <script src="{{ path ~ 'lunr.stemmer.support.js' | url }}"></script>
           {% for language in languages | map("trim") %}
             {% if language != "en" %}
               {% if language == "jp" %}
-                <script src="{{ path + 'tinyseg.js' | url }}"></script>
+                <script src="{{ path ~ 'tinyseg.js' | url }}"></script>
               {% endif %}
               {% if language in ("da", "de", "du", "es", "fi", "fr", "hu", "it", "jp", "no", "pt", "ro", "ru", "sv", "tr") %}
-                <script src="{{ path + 'lunr.' + language + '.js' | url }}"></script>
+                <script src="{{ path ~ 'lunr.' ~ language ~ '.js' | url }}"></script>
               {% endif %}
             {% endif %}
           {% endfor %}
           {% if languages | length > 1 %}
-            <script src="{{ path + 'lunr.multi.js' | url }}"></script>
+            <script src="{{ path ~ 'lunr.multi.js' | url }}"></script>
           {% endif %}
         {% endif %}
       {% endif %}
diff --git a/src/base.html b/src/base.html
index 920bfb8bf..52c33d151 100644
--- a/src/base.html
+++ b/src/base.html
@@ -329,20 +329,20 @@
         {% set languages = lang.t("search.language").split(",") %}
         {% if languages | length and languages[0] != "" %}
           {% set path = "/assets/javascripts/lunr/" %}
-          <script src="{{ path + 'lunr.stemmer.support.js' | url }}"></script>
+          <script src="{{ path ~ 'lunr.stemmer.support.js' | url }}"></script>
           {% for language in languages | map("trim") %}
             {% if language != "en" %}
               {% if language == "jp" %}
-                <script src="{{ path + 'tinyseg.js' | url }}"></script>
+                <script src="{{ path ~ 'tinyseg.js' | url }}"></script>
               {% endif %}
               {% if language in ($md-lunr-languages$) %}
-                <script src="{{ path + 'lunr.' + language + '.js' | url }}">
+                <script src="{{ path ~ 'lunr.' ~ language ~ '.js' | url }}">
                 </script>
               {% endif %}
             {% endif %}
           {% endfor %}
           {% if languages | length > 1 %}
-            <script src="{{ path + 'lunr.multi.js' | url }}"></script>
+            <script src="{{ path ~ 'lunr.multi.js' | url }}"></script>
           {% endif %}
         {% endif %}
       {% endif %}