diff --git a/cpp/conf/server_config.template b/cpp/conf/server_config.template
index 8c81315de991991b951d41deecef75d38f41d7f3..ff5cfc6cd531489d6c9fef67c2db98c4065188e5 100644
--- a/cpp/conf/server_config.template
+++ b/cpp/conf/server_config.template
@@ -8,7 +8,7 @@ db_config:
   db_path: @MILVUS_DB_PATH@             # milvus data storage path
   db_slave_path:                        # secondry data storage path, split by semicolon
 
-  parallel_reduce: true                 # use multi-threads to reduce topk result
+  parallel_reduce: false                 # use multi-threads to reduce topk result
 
   # URI format: dialect://username:password@host:port/database
   # All parts except dialect are optional, but you MUST include the delimiters