diff --git a/core/src/config/ConfigMgr.cpp b/core/src/config/ConfigMgr.cpp
index 994737aac38919329bbc919f9811f92f8e7e1bb8..431754014da534f97dd863ab8ef3e6620091d310 100644
--- a/core/src/config/ConfigMgr.cpp
+++ b/core/src/config/ConfigMgr.cpp
@@ -166,7 +166,7 @@ ConfigMgr::ConfigMgr() {
         /* invisible */
         /* engine */
         {"engine.build_index_threshold",
-         CreateIntegerConfig("engine.build_index_threshold", false, 0, std::numeric_limits<int64_t>::max(),
+         CreateIntegerConfig("engine.build_index_threshold", true, 0, std::numeric_limits<int64_t>::max(),
                              &config.engine.build_index_threshold.value, 4096, nullptr, nullptr)},
         {"engine.search_combine_nq",
          CreateIntegerConfig("engine.search_combine_nq", true, 0, std::numeric_limits<int64_t>::max(),