diff --git a/cpp/bench/ann/src/faiss/faiss_gpu_wrapper.h b/cpp/bench/ann/src/faiss/faiss_gpu_wrapper.h
index 3ace6aa615..de021543fc 100644
--- a/cpp/bench/ann/src/faiss/faiss_gpu_wrapper.h
+++ b/cpp/bench/ann/src/faiss/faiss_gpu_wrapper.h
@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: Copyright (c) 2023-2025, NVIDIA CORPORATION.
+ * SPDX-FileCopyrightText: Copyright (c) 2023-2026, NVIDIA CORPORATION.
  * SPDX-License-Identifier: Apache-2.0
  */
 #pragma once
@@ -9,6 +9,10 @@
 #include "../cuvs/cuvs_ann_bench_utils.h"
 #include <cuvs/neighbors/refine.hpp>
 
+// FAISS classes partially override the overloaded virtual Index::train, triggering
+// NVCC warning 611 which -Werror=all-warnings promotes to an error.
+#pragma nv_diagnostic push
+#pragma nv_diag_suppress 611
 #include <faiss/IndexFlat.h>
 #include <faiss/IndexHNSW.h>
 #include <faiss/IndexIVFFlat.h>
@@ -23,6 +27,7 @@
 #include <faiss/gpu/StandardGpuResources.h>
 #include <faiss/impl/ScalarQuantizer.h>
 #include <faiss/index_io.h>
+#pragma nv_diagnostic pop
 #include <omp.h>
 
 #include <raft/core/device_mdarray.hpp>