diff --git a/layouts/partials/header.html b/layouts/partials/header.html
index 03abba57..75c31799 100644
--- a/layouts/partials/header.html
+++ b/layouts/partials/header.html
@@ -48,7 +48,7 @@
             {{- end }}
             <div class="logo-switches">
                 {{- if (not site.Params.disableThemeToggle) }}
-                <button id="theme-toggle" accesskey="t" title="(Alt + T)">
+                <button type="button" id="theme-toggle" accesskey="t" title="(Alt + T)">
                     <svg id="moon" xmlns="http://www.w3.org/2000/svg" width="24" height="18" viewBox="0 0 24 24"
                         fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round"
                         stroke-linejoin="round">