diff --git a/artifacts/api-server/build.ts b/artifacts/api-server/build.ts
index 3a66ebe..30043d2 100644
--- a/artifacts/api-server/build.ts
+++ b/artifacts/api-server/build.ts
@@ -1,7 +1,7 @@
 import path from "path";
 import { fileURLToPath } from "url";
 import { build as esbuild } from "esbuild";
-import { rm, readFile } from "fs/promises";
+import { rm, readFile, writeFile } from "fs/promises";
 
 const __filename = fileURLToPath(import.meta.url);
 const __dirname = path.dirname(__filename);
@@ -70,6 +70,15 @@ async function buildAll() {
     external: externals,
     logLevel: "info",
   });
+
+  // Write a thin CJS shim so both dist/index.cjs (legacy .replit deployment
+  // config) and dist/index.js (artifact.toml run command) resolve to the same bundle.
+  await writeFile(
+    path.resolve(distDir, "index.cjs"),
+    `// shim: delegates to dist/index.js\nrequire('./index.js');\n`,
+    "utf-8",
+  );
+  console.log("  dist/index.cjs  (shim → index.js)");
 }
 
 buildAll().catch((err) => {