diff --git a/server/container-baby.ts b/server/container-baby.ts
index 24e30c9..67f286c 100644
--- a/server/container-baby.ts
+++ b/server/container-baby.ts
@@ -1,5 +1,5 @@
 import { execFile as _execFile } from "node:child_process";
-import { access, mkdir, open, writeFile } from "node:fs/promises";
+import { access, mkdir, open, rename, writeFile } from "node:fs/promises";
 import { join } from "node:path";
 import { tar2squashfs } from "./tar2squashfs.js";
 import { subtle } from "node:crypto";
@@ -76,6 +76,7 @@ async function saveSquashfs(
   if (!p) {
     p = (async () => {
       const output = join(cacheDir, key);
+      const progressFile = output + ".downloading";
       try {
         await access(output);
         // ya está cacheado
@@ -92,7 +93,7 @@ async function saveSquashfs(
           const res = await getBlob(image, layer.digest);
           return res.body!;
         });
-        await tar2squashfs(layerStreams, output, [
+        await tar2squashfs(layerStreams, progressFile, [
           {
             content: configJson,
             headers: {
@@ -103,6 +104,7 @@ async function saveSquashfs(
             },
           },
         ]);
+        await rename(progressFile, output);
       }
       return output;
     })();