diff --git a/layouts/partials/sections/header.html b/layouts/partials/sections/header.html
index 3bbab84d..d44336fd 100644
--- a/layouts/partials/sections/header.html
+++ b/layouts/partials/sections/header.html
@@ -1,5 +1,5 @@
{{- /* theme-toggle is enabled */}}
-{{- if (not .Site.Params.theme.disableThemeToggle) }}
+{{- if (not .Site.Params.theme.disableThemeToggle | default false) }}
{{- /* theme is auto */}}