diff --git a/packages/docusaurus-1.x/lib/server/utils.js b/packages/docusaurus-1.x/lib/server/utils.js
index 905ffb883707..54c409248303 100644
--- a/packages/docusaurus-1.x/lib/server/utils.js
+++ b/packages/docusaurus-1.x/lib/server/utils.js
@@ -53,6 +53,7 @@ function minifyCss(cssContent) {
     .process(cssContent, {
       preset: 'default',
       zindex: false,
+      from: undefined,
     })
     .then(result => result.css);
 }