diff --git a/packages/benchmark.js-plugin/src/index.ts b/packages/benchmark.js-plugin/src/index.ts
index 3abece7..8d7a8a5 100644
--- a/packages/benchmark.js-plugin/src/index.ts
+++ b/packages/benchmark.js-plugin/src/index.ts
@@ -177,16 +177,21 @@ async function runBenchmarks({
     } else {
       benchPayload = bench.fn as CallableFunction;
     }
+
     if (isAsync) {
       await optimizeFunction(benchPayload);
-      measurement.startInstrumentation();
-      await benchPayload();
-      measurement.stopInstrumentation(uri);
+      await (async function __codspeed_root_frame__() {
+        measurement.startInstrumentation();
+        await benchPayload();
+        measurement.stopInstrumentation(uri);
+      })();
     } else {
       optimizeFunctionSync(benchPayload);
-      measurement.startInstrumentation();
-      benchPayload();
-      measurement.stopInstrumentation(uri);
+      (function __codspeed_root_frame__() {
+        measurement.startInstrumentation();
+        benchPayload();
+        measurement.stopInstrumentation(uri);
+      })();
     }
     console.log(`    ✔ Measured ${uri}`);
     benchmarkCompletedListeners.forEach((listener) => listener());
diff --git a/packages/tinybench-plugin/src/index.ts b/packages/tinybench-plugin/src/index.ts
index 422e498..e884630 100644
--- a/packages/tinybench-plugin/src/index.ts
+++ b/packages/tinybench-plugin/src/index.ts
@@ -24,14 +24,12 @@ export function withCodSpeed(bench: Bench): Bench {
     console.log(`[CodSpeed] running with @codspeed/tinybench v${__VERSION__}`);
     for (const task of bench.tasks) {
       const uri = callingFile + "::" + task.name;
-      // eslint-disable-next-line no-inner-declarations
-      async function __codspeed_root_frame__() {
+      await optimizeFunction(task.fn());
+      await (async function __codspeed_root_frame__() {
+        measurement.startInstrumentation();
         await task.fn();
-      }
-      await optimizeFunction(__codspeed_root_frame__);
-      measurement.startInstrumentation();
-      await __codspeed_root_frame__();
-      measurement.stopInstrumentation(uri);
+        measurement.stopInstrumentation(uri);
+      })();
       console.log(`    ✔ Measured ${uri}`);
     }
     console.log(`[CodSpeed] Done running ${bench.tasks.length} benches.`);