diff --git a/thirdparty/DiskANN/src/index.cpp b/thirdparty/DiskANN/src/index.cpp
index 86157932..3727e4d6 100644
--- a/thirdparty/DiskANN/src/index.cpp
+++ b/thirdparty/DiskANN/src/index.cpp
@@ -1648,6 +1648,7 @@ namespace diskann {
           }
         }
         knowhere::WaitAllSuccess(futures);
+        futures.clear();
 
         diff = std::chrono::high_resolution_clock::now() - s;
         inter_time += diff.count();
diff --git a/thirdparty/DiskANN/src/partition_and_pq.cpp b/thirdparty/DiskANN/src/partition_and_pq.cpp
index e3eb0da3..5b6bcdcd 100644
--- a/thirdparty/DiskANN/src/partition_and_pq.cpp
+++ b/thirdparty/DiskANN/src/partition_and_pq.cpp
@@ -578,6 +578,7 @@ int generate_pq_data_from_pivots(const std::string data_file,
       }));
     }
     knowhere::WaitAllSuccess(futures);
+    futures.clear();
 
     if (num_centers > 256) {
       compressed_file_writer.write(