diff --git a/tests/benchmark/milvus_benchmark/config.py b/tests/benchmark/milvus_benchmark/config.py
index 409c8b5f4f..0a81db8910 100644
--- a/tests/benchmark/milvus_benchmark/config.py
+++ b/tests/benchmark/milvus_benchmark/config.py
@@ -50,5 +50,6 @@ MINIO_SECRET_KEY = "minioadmin"
 MINIO_BUCKET_NAME = "test"
 
 FLUSH_PRECISION = 4
+INDEX_PRECISION = 4
 COMMON_PRECISION = 4