diff --git a/faiss/IndexHNSW.h b/faiss/IndexHNSW.h
index c796d7e18a..2d983b3c16 100644
--- a/faiss/IndexHNSW.h
+++ b/faiss/IndexHNSW.h
@@ -138,7 +138,7 @@ struct IndexHNSWPQ : IndexHNSW {
     void train(idx_t n, const float* x) override;
 };
 
-/** SQ index topped with with a HNSW structure to access elements
+/** SQ index topped with a HNSW structure to access elements
  *  more efficiently.
  */
 struct IndexHNSWSQ : IndexHNSW {