diff --git a/packages/coding-agent/src/tools/browser/launch.ts b/packages/coding-agent/src/tools/browser/launch.ts
index 3019a69b3..3e0e36abc 100644
--- a/packages/coding-agent/src/tools/browser/launch.ts
+++ b/packages/coding-agent/src/tools/browser/launch.ts
@@ -214,8 +214,7 @@ async function isChromiumExecutable(p: string): Promise<boolean> {
 		});
 		const stdout = await Promise.race([
 			new Response(proc.stdout).text(),
-			proc.exited.then(() => null),
-			Bun.sleep(probeTimeoutMs).then(() => null),
+			Bun.sleep(probeTimeoutMs + 500).then(() => null),
 		]);
 		if (stdout === null) return false;
 		await proc.exited;