diff --git a/lib/prepare/index.js b/lib/prepare/index.js
index 70a90a45bd..7561f79158 100644
--- a/lib/prepare/index.js
+++ b/lib/prepare/index.js
@@ -24,11 +24,11 @@ module.exports = async function prepare (sourceDir) {
   await writeTemp('siteData.js', dataCode)
 
   // 4. handle user override
-  const overridePath = path.resolve(sourceDir, '.vuepress/override.styl')
+  const overridePath = path.resolve(sourceDir, '.vuepress/override.styl').replace(/[\\]+/g, '/')
   const hasUserOverride = fs.existsSync(overridePath)
   await writeTemp('override.styl', hasUserOverride ? `@import(${JSON.stringify(overridePath)})` : ``)
 
-  const stylePath = path.resolve(sourceDir, '.vuepress/style.styl')
+  const stylePath = path.resolve(sourceDir, '.vuepress/style.styl').replace(/[\\]+/g, '/')
   const hasUserStyle = fs.existsSync(stylePath)
   await writeTemp('style.styl', hasUserStyle ? `@import(${JSON.stringify(stylePath)})` : ``)