diff --git a/include/rabitqlib/index/hnsw/hnsw.hpp b/include/rabitqlib/index/hnsw/hnsw.hpp
index 3fef418..e8e71e9 100644
--- a/include/rabitqlib/index/hnsw/hnsw.hpp
+++ b/include/rabitqlib/index/hnsw/hnsw.hpp
@@ -1197,7 +1197,11 @@ void HierarchicalNSW::searchBaseLayerST_AdaptiveRerankOpt(
     float distk = 1e10;
 
     EstimateRecord start_estimate_record;
-    get_full_est(q_to_centroids, query_wrapper, ep_id, start_estimate_record);
+    if (ex_bits_ == 0) {
+        get_bin_est(q_to_centroids, query_wrapper, ep_id, start_estimate_record);
+    } else {
+        get_full_est(q_to_centroids, query_wrapper, ep_id, start_estimate_record);
+    }
     float est_dist = start_estimate_record.est_dist;
     float low_dist = start_estimate_record.low_dist;