diff --git a/layouts/partials/docs/html-head.html b/layouts/partials/docs/html-head.html
index 5548e9464b9dba8891143ae92ca9883ddac7ec2c..7cae998a4cabc895a133622b98aa92a38d7dfc90 100644
--- a/layouts/partials/docs/html-head.html
+++ b/layouts/partials/docs/html-head.html
@@ -23,7 +23,7 @@
 {{- end -}}
 
 <!-- Theme stylesheet, you can customize scss by creating `assets/custom.scss` in your website -->
-{{- $styles := resources.Get "book.scss" | resources.ExecuteAsTemplate "book.scss" . | resources.ToCSS | resources.Minify | resources.Fingerprint }}
+{{- $styles := resources.Get "book.scss" | resources.ExecuteAsTemplate "book.scss" . | css.Sass | resources.Minify | resources.Fingerprint }}
 <link rel="stylesheet" href="{{ $styles.RelPermalink }}" {{ template "integrity" $styles }}>
 
 {{- if default true .Site.Params.BookSearch -}}