diff --git a/packages/vite/src/node/plugins/resolve.ts b/packages/vite/src/node/plugins/resolve.ts
index 3206e5e6a7cba4..165620722cb2fc 100644
--- a/packages/vite/src/node/plugins/resolve.ts
+++ b/packages/vite/src/node/plugins/resolve.ts
@@ -12,6 +12,7 @@ import {
   isExternalUrl,
   isObject,
   normalizePath,
+  fsPathFromId,
   resolveFrom
 } from '../utils'
 import { ViteDevServer } from '..'
@@ -60,8 +61,7 @@ export function resolvePlugin({
 
       // explicit fs paths that starts with /@fs/*
       if (asSrc && id.startsWith(FS_PREFIX)) {
-        let fsPath = id.slice(FS_PREFIX.length - 1)
-        if (fsPath.startsWith('//')) fsPath = fsPath.slice(1)
+        const fsPath = fsPathFromId(id)
         res = tryFsResolve(fsPath, false)
         isDebug && debug(`[@fs] ${chalk.cyan(id)} -> ${chalk.dim(res)}`)
         // always return here even if res doesn't exist since /@fs/ is explicit
diff --git a/packages/vite/src/node/utils.ts b/packages/vite/src/node/utils.ts
index f2b617de8d04f1..1518b5c8d38a88 100644
--- a/packages/vite/src/node/utils.ts
+++ b/packages/vite/src/node/utils.ts
@@ -59,6 +59,11 @@ export function normalizePath(id: string): string {
   return path.posix.normalize(id)
 }
 
+export function fsPathFromId(id: string): string {
+  const fsPath = normalizePath(id.slice(FS_PREFIX.length))
+  return fsPath.startsWith('/') ? fsPath : `/${fsPath}`
+}
+
 export const queryRE = /\?.*$/
 export const hashRE = /#.*$/