diff --git a/apps/server/src/config.ts b/apps/server/src/config.ts
index 720d8ea96..c8efda0b3 100644
--- a/apps/server/src/config.ts
+++ b/apps/server/src/config.ts
@@ -79,6 +79,13 @@ export function assertApiDeploymentConfig(
   );
 }
 
+/** Accept a full worker URL, or host:port from a platform that omits the scheme. */
+export function browserWorkerUrl(value?: string): string | undefined {
+  const trimmed = value?.trim();
+  if (!trimmed) return undefined;
+  return trimmed.includes("://") ? trimmed : `http://${trimmed}`;
+}
+
 // Provider SDKs retry transient failures before the response starts, with
 // exponential backoff: OpenAI and Anthropic retry HTTP 408, 409, 429, 5xx and
 // connection errors and honor retry-after; Gemini retries 408, 429, 500, 502,
@@ -124,7 +131,7 @@ export function readConfig(): Config {
     googleClientId: process.env.GOOGLE_CLIENT_ID,
     googleClientSecret: process.env.GOOGLE_CLIENT_SECRET,
     googleRedirectUri: `${publicUrl}/api/google/callback`,
-    workerUrl: process.env.BROWSER_WORKER_URL,
+    workerUrl: browserWorkerUrl(process.env.BROWSER_WORKER_URL),
     workerToken: process.env.WORKER_TOKEN,
     taskWorkerEnabled: process.env.TASK_WORKER_ENABLED !== "false",
     computerEnabled: process.env.COMPUTER_ENABLED === "true",
diff --git a/tests/config.test.ts b/tests/config.test.ts
index 3e38f2241..148720749 100644
--- a/tests/config.test.ts
+++ b/tests/config.test.ts
@@ -2,6 +2,7 @@ import assert from "node:assert/strict";
 import { test } from "node:test";
 import {
   assertApiDeploymentConfig,
+  browserWorkerUrl,
   type Config,
   shadowedEnvKeys,
 } from "../apps/server/src/config.ts";
@@ -79,6 +80,14 @@ test("Jev mode is off by default and validates explicit modes", async () => {
   }
 });
 
+test("browser worker URL keeps an existing scheme and adds http to host:port", () => {
+  assert.equal(browserWorkerUrl(undefined), undefined);
+  assert.equal(browserWorkerUrl("  "), undefined);
+  assert.equal(browserWorkerUrl("http://127.0.0.1:8790"), "http://127.0.0.1:8790");
+  assert.equal(browserWorkerUrl("https://browser.internal:8790"), "https://browser.internal:8790");
+  assert.equal(browserWorkerUrl("openmuse-browser-h4fx:8790"), "http://openmuse-browser-h4fx:8790");
+});
+
 test("environment variables that override a different .env value are reported by name", () => {
   const file = { OPENAI_API_KEY: "sk-or-file", MODEL: "openai/gpt-5", PORT: "8787", EMPTY: "" };
   const env = { OPENAI_API_KEY: "sk-proj-system", MODEL: "openai/gpt-5", EMPTY: "set" };