diff --git a/core/src/server/grpc_impl/GrpcRequestHandler.cpp b/core/src/server/grpc_impl/GrpcRequestHandler.cpp
index 9dc1fbd3f6..5bd04a72b0 100644
--- a/core/src/server/grpc_impl/GrpcRequestHandler.cpp
+++ b/core/src/server/grpc_impl/GrpcRequestHandler.cpp
@@ -544,9 +544,8 @@ GrpcRequestHandler::SearchInFiles(::grpc::ServerContext* context, const ::milvus
 
     // step 3: partition tags
     std::vector<std::string> partitions;
-    for (auto& partition : search_request->partition_tag_array()) {
-        partitions.emplace_back(partition);
-    }
+    std::copy(search_request->partition_tag_array().begin(), search_request->partition_tag_array().end(),
+              std::back_inserter(partitions));
 
     // step 4: parse extra parameters
     milvus::json json_params;