diff --git a/scripts/package_lambdas.mjs b/scripts/package_lambdas.mjs
index 9045676..f1b239b 100644
--- a/scripts/package_lambdas.mjs
+++ b/scripts/package_lambdas.mjs
@@ -8,7 +8,7 @@
 import { spawn, spawnSync } from "node:child_process";
 import { cpSync, existsSync, mkdirSync, mkdtempSync, rmSync, writeFileSync } from "node:fs";
 import { tmpdir } from "node:os";
-import { join } from "node:path";
+import { join, resolve } from "node:path";
 import { fileURLToPath } from "node:url";
 
 const ROOT = fileURLToPath(new URL("..", import.meta.url));
@@ -28,7 +28,7 @@ function parseArgs(argv) {
     if (arg === "--git-sha") {
       out.gitSha = argv[++i];
     } else if (arg === "--out-dir") {
-      out.outDir = argv[++i];
+      out.outDir = resolve(argv[++i]);
     } else if (arg === "--only") {
       out.only.push(argv[++i]);
     } else {
@@ -69,7 +69,7 @@ async function build(name, gitSha, outDir) {
       throw new Error("npm ci --omit=dev failed");
     }
     mkdirSync(outDir, { recursive: true });
-    const zipPath = join(outDir, `${name}.zip`);
+    const zipPath = resolve(outDir, `${name}.zip`);
     rmSync(zipPath, { force: true });
     await zipDir(dest, zipPath);
     return zipPath;