diff --git a/vectordb_bench/backend/runner/mp_runner.py b/vectordb_bench/backend/runner/mp_runner.py
index 3b99cfe6e..6a9f7c979 100644
--- a/vectordb_bench/backend/runner/mp_runner.py
+++ b/vectordb_bench/backend/runner/mp_runner.py
@@ -2,6 +2,7 @@
 import traceback
 import concurrent
 import multiprocessing as mp
+import random
 import logging
 from typing import Iterable
 import numpy as np
@@ -46,7 +47,7 @@ def search(self, test_data: list[list[float]], q: mp.Queue, cond: mp.Condition)
             cond.wait()
 
         with self.db.init():
-            num, idx = len(test_data), 0
+            num, idx = len(test_data), random.randint(0, len(test_data) - 1)
 
             start_time = time.perf_counter()
             count = 0