diff --git a/.changeset/honest-apricots-wink.md b/.changeset/honest-apricots-wink.md
new file mode 100644
index 0000000..ce4c76a
--- /dev/null
+++ b/.changeset/honest-apricots-wink.md
@@ -0,0 +1,5 @@
+---
+"@marko/run": patch
+---
+
+Fix build command failing on Windows
diff --git a/package.json b/package.json
index a3c5659..78d48d3 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
     "lint": "eslint --format unix . && prettier . --check --with-node-modules --log-level=warn",
     "prepare": "husky",
     "report": "open ./coverage/lcov-report/index.html",
-    "test": "cross-env NODE_ENV=test NODE_OPTIONS='$NODE_OPTIONS --import tsx' mocha",
+    "test": "cross-env NODE_ENV=test NODE_OPTIONS=\"$NODE_OPTIONS --import tsx\" mocha",
     "test:update": "cross-env UPDATE_EXPECTATIONS=1 npm test -- --update"
   },
   "devDependencies": {
diff --git a/packages/run/src/vite/plugin.ts b/packages/run/src/vite/plugin.ts
index 25663b3..c35d809 100644
--- a/packages/run/src/vite/plugin.ts
+++ b/packages/run/src/vite/plugin.ts
@@ -575,7 +575,7 @@ export default function markoRun(opts: Options = {}): Plugin[] {
       },
       async resolveId(importee, importer) {
         if (importee === "@marko/run/router") {
-          return path.resolve(root, ROUTER_FILENAME);
+          return normalizePath(path.resolve(root, ROUTER_FILENAME));
         } else if (
           importee.endsWith(".marko") &&
           importee.includes(relativeEntryFilesDirPosix)