diff --git a/packages/vite/src/utils/index.ts b/packages/vite/src/utils/index.ts
index ef1262cffb..0feb1b5ca5 100644
--- a/packages/vite/src/utils/index.ts
+++ b/packages/vite/src/utils/index.ts
@@ -7,7 +7,7 @@ export function uniq<T> (arr: T[]): T[] {
 }
 
 // Copied from vue-bundle-renderer utils
-const IS_CSS_RE = /\.(?:css|scss|sass|postcss|less|stylus|styl)(\?[^.]+)?$/
+const IS_CSS_RE = /\.(?:css|scss|sass|postcss|pcss|less|stylus|styl)(\?[^.]+)?$/
 
 export function isCSS (file: string) {
   return IS_CSS_RE.test(file)