diff --git a/v4/layouts/partials/check-theme-prefer.html b/v4/layouts/partials/check-theme-prefer.html
index 0878cbbd..c6299b47 100644
--- a/v4/layouts/partials/check-theme-prefer.html
+++ b/v4/layouts/partials/check-theme-prefer.html
@@ -1,5 +1,5 @@
 {{ $checkThemePrefer := resources.Get "js/check-theme-prefer.js" }}
-{{ if or (.Site.IsServer) (eq hugo.Environment "development") }}
+{{ if or (hugo.IsServer) (eq hugo.Environment "development") }}
     <script src="{{ $checkThemePrefer.Permalink }}"></script>
 {{ else }}
     {{ $checkThemePrefer := $checkThemePrefer | resources.Minify | resources.Fingerprint }}
diff --git a/v4/layouts/partials/css.html b/v4/layouts/partials/css.html
index 5df6332f..631f6567 100644
--- a/v4/layouts/partials/css.html
+++ b/v4/layouts/partials/css.html
@@ -1,7 +1,7 @@
 {{ $options := dict "targetPath" "theme.css" "enableSourceMap" true "precision" 6 }}
 {{ $css := resources.Get "sass/theme.scss" | resources.ExecuteAsTemplate "theme.scss" . | toCSS $options }}
 
-{{ if or (.Site.IsServer) (eq hugo.Environment "development") }}
+{{ if or (hugo.IsServer) (eq hugo.Environment "development") }}
     <link id="theme-css" rel="stylesheet" href="{{ $css.Permalink }}" media="screen">
 {{ else }}
     {{ $css := $css | resources.Minify | resources.Fingerprint }}
diff --git a/v4/layouts/partials/js.html b/v4/layouts/partials/js.html
index 67fd781a..fac25e0d 100644
--- a/v4/layouts/partials/js.html
+++ b/v4/layouts/partials/js.html
@@ -27,7 +27,7 @@
 
 {{ $js := $jsToConcat | resources.Concat "theme.js" }}
 
-{{ if or (.Site.IsServer) (eq hugo.Environment "development") }}
+{{ if or (hugo.IsServer) (eq hugo.Environment "development") }}
     <script src="{{ $js.Permalink }}"></script>
 {{ else }}
     {{ $js := $js | resources.Minify | resources.Fingerprint }}