diff --git a/packages/void/src/cli/package.ts b/packages/void/src/cli/package.ts
index 12d7a38a2..06f1c9bcf 100644
--- a/packages/void/src/cli/package.ts
+++ b/packages/void/src/cli/package.ts
@@ -13,6 +13,7 @@ import type {
   WebSocketManifestMeta,
 } from "./types";
 import type { WebSocketRouteDefinition } from "../router/websocket";
+import { toSlash } from "../shared/utils";
 
 /**
  * Compute a CF-compatible asset hash: SHA-256, first 32 hex chars.
@@ -41,7 +42,7 @@ export function collectAndHashAssets(dir: string): {
   try {
     const files = collectFiles(dir);
     for (const filePath of files) {
-      const relativePath = "/" + relative(dir, filePath);
+      const relativePath = "/" + toSlash(relative(dir, filePath));
       const content = readFileSync(filePath);
       assetManifest[relativePath] = {
         hash: computeAssetHash(content),
@@ -223,7 +224,7 @@ export function packageBuild(
   const workerDir = join(distDir, workerDirName);
   const workerFiles = collectFiles(workerDir);
   for (const filePath of workerFiles) {
-    const relativePath = relative(workerDir, filePath);
+    const relativePath = toSlash(relative(workerDir, filePath));
     if (!isWorkerModule(relativePath)) continue;
     const content = readFileSync(filePath);
     formData.append(`worker:${relativePath}`, new Blob([content]), relativePath);
@@ -234,7 +235,7 @@ export function packageBuild(
   try {
     const clientFiles = collectFiles(clientDir);
     for (const filePath of clientFiles) {
-      const relativePath = relative(clientDir, filePath);
+      const relativePath = toSlash(relative(clientDir, filePath));
       if (neededAssets && !neededAssets.has("/" + relativePath)) continue;
       const content = readFileSync(filePath);
       formData.append(`asset:${relativePath}`, new Blob([content]), relativePath);
@@ -286,7 +287,7 @@ export function packageStaticBuild(
 
   const files = collectFiles(outputDir);
   for (const filePath of files) {
-    const relativePath = relative(outputDir, filePath);
+    const relativePath = toSlash(relative(outputDir, filePath));
     if (neededAssets && !neededAssets.has("/" + relativePath)) continue;
     const content = readFileSync(filePath);
     formData.append(`asset:${relativePath}`, new Blob([content]), relativePath);
@@ -396,7 +397,7 @@ export function packageFrameworkBuild(opts: {
   // Worker files
   const workerFiles = collectFiles(opts.workerDir);
   for (const filePath of workerFiles) {
-    const relativePath = relative(opts.workerDir, filePath);
+    const relativePath = toSlash(relative(opts.workerDir, filePath));
     if (!isWorkerModule(relativePath)) continue;
     const content = readFileSync(filePath);
     formData.append(`worker:${relativePath}`, new Blob([content]), relativePath);
@@ -408,7 +409,7 @@ export function packageFrameworkBuild(opts: {
     for (const filePath of assetFiles) {
       // Skip worker files when workerDir overlaps with assetsDir
       if (isOverlap && filePath.replace(/\\/g, "/").startsWith(workerDirNorm)) continue;
-      const relativePath = relative(opts.assetsDir, filePath);
+      const relativePath = toSlash(relative(opts.assetsDir, filePath));
       if (opts.neededAssets && !opts.neededAssets.has("/" + relativePath)) continue;
       const content = readFileSync(filePath);
       formData.append(`asset:${relativePath}`, new Blob([content]), relativePath);
diff --git a/packages/void/src/shared/utils.ts b/packages/void/src/shared/utils.ts
new file mode 100644
index 000000000..ae61cd968
--- /dev/null
+++ b/packages/void/src/shared/utils.ts
@@ -0,0 +1,15 @@
+import { posix } from "node:path";
+
+export const isWindows: boolean = typeof process !== "undefined" && process.platform === "win32";
+
+export function slash(p: string): string {
+  return p.replace(/\\/g, "/");
+}
+
+export function toSlash(p: string): string {
+  return isWindows ? slash(p) : p;
+}
+
+export function normalizePath(id: string): string {
+  return posix.normalize(toSlash(id));
+}