diff --git a/faiss/IndexHNSW.cpp b/faiss/IndexHNSW.cpp
index 52e4315c90..c9b62a390a 100644
--- a/faiss/IndexHNSW.cpp
+++ b/faiss/IndexHNSW.cpp
@@ -899,7 +899,7 @@ IndexHNSWSQ::IndexHNSWSQ(
         int M,
         MetricType metric)
         : IndexHNSW(new IndexScalarQuantizer(d, qtype, metric), M) {
-    is_trained = false;
+    is_trained = this->storage->is_trained;
     own_fields = true;
 }