diff --git a/bench/fixtures/utils.ts b/bench/fixtures/utils.ts
index 6b9c2e5..68bf77d 100644
--- a/bench/fixtures/utils.ts
+++ b/bench/fixtures/utils.ts
@@ -1,12 +1,14 @@
 import { fileURLToPath } from "node:url";
-import { spawnSync } from "node:child_process";
+import { spawn } from "node:child_process";
 
 export const fixture = (name: string) => {
   return new URL(`./${name}/mod.ts`, import.meta.url);
 };
 
-export const spawnFixture = (name: string) =>
-  spawnSync(process.execPath, [
-    ...process.execArgv,
-    fileURLToPath(fixture(name)),
-  ], { stdio: "ignore" });
+export const spawnFixture = (name: string): Promise<void> =>
+  new Promise((resolve) => {
+    spawn(process.execPath, [
+      ...process.execArgv,
+      fileURLToPath(fixture(name)),
+    ], { stdio: "ignore" }).on("close", resolve);
+  });
diff --git a/bench/startup.bench.ts b/bench/startup.bench.ts
index 1535ce0..5a559d0 100644
--- a/bench/startup.bench.ts
+++ b/bench/startup.bench.ts
@@ -5,12 +5,8 @@ import { spawnFixture } from "./fixtures/utils.ts";
 let bench = withCodSpeed(new Bench({ name: "startup" }));
 
 bench
-  .add("createTerm", async () => {
-    spawnFixture("create-term");
-  })
-  .add("time to first render", async () => {
-    spawnFixture("render-minimal");
-  });
+  .add("createTerm", () => spawnFixture("create-term"))
+  .add("time to first render", () => spawnFixture("render-minimal"));
 
 await bench.run();
 console.table(bench.table());