diff --git a/scripts/test-docker-all.mjs b/scripts/test-docker-all.mjs
index 842a59223b8..a847c7baa6f 100644
--- a/scripts/test-docker-all.mjs
+++ b/scripts/test-docker-all.mjs
@@ -634,10 +634,20 @@ function appendExtension(env, extension) {
 }
 
 function commandEnv(extra = {}) {
-  return {
+  const env = {
     ...process.env,
     ...extra,
   };
+  const pathEntries = [
+    env.PATH,
+    env.PNPM_HOME,
+    env.npm_execpath ? path.dirname(env.npm_execpath) : undefined,
+    path.dirname(process.execPath),
+  ]
+    .flatMap((entry) => (entry ? String(entry).split(path.delimiter) : []))
+    .filter(Boolean);
+  env.PATH = [...new Set(pathEntries)].join(path.delimiter);
+  return env;
 }
 
 function shellQuote(value) {
diff --git a/test/scripts/docker-build-helper.test.ts b/test/scripts/docker-build-helper.test.ts
index 82e7096fb81..28f36e9388b 100644
--- a/test/scripts/docker-build-helper.test.ts
+++ b/test/scripts/docker-build-helper.test.ts
@@ -2,6 +2,7 @@ import { readFileSync } from "node:fs";
 import { describe, expect, it } from "vitest";
 
 const HELPER_PATH = "scripts/lib/docker-build.sh";
+const DOCKER_ALL_SCHEDULER_PATH = "scripts/test-docker-all.mjs";
 const CENTRALIZED_BUILD_SCRIPTS = [
   "scripts/docker/setup.sh",
   "scripts/e2e/browser-cdp-snapshot-docker.sh",
@@ -35,4 +36,13 @@ describe("docker build helper", () => {
       expect(script, path).not.toMatch(/run_logged\s+\S+\s+docker\s+build/);
     }
   });
+
+  it("preserves pnpm lookup paths for scheduled Docker child lanes", () => {
+    const scheduler = readFileSync(DOCKER_ALL_SCHEDULER_PATH, "utf8");
+
+    expect(scheduler).toContain("env.PNPM_HOME");
+    expect(scheduler).toContain("env.npm_execpath ? path.dirname(env.npm_execpath)");
+    expect(scheduler).toContain("path.dirname(process.execPath)");
+    expect(scheduler).toContain("env.PATH = [...new Set(pathEntries)].join(path.delimiter)");
+  });
 });