diff --git a/core/src/index/unittest/faiss_benchmark/faiss_benchmark_test.cpp b/core/src/index/unittest/faiss_benchmark/faiss_benchmark_test.cpp
index 3d60574231..0c7cb97807 100644
--- a/core/src/index/unittest/faiss_benchmark/faiss_benchmark_test.cpp
+++ b/core/src/index/unittest/faiss_benchmark/faiss_benchmark_test.cpp
@@ -475,7 +475,7 @@ void test_ivfsq8h_gpu(const std::string& ann_test_name,
         long *I = new  faiss::Index::idx_t[NQ * K];
         float *D = new float[NQ * K];
 
-        printf ("\n%s | %s | nprobe=%lu\n", ann_test_name.c_str(), index_key.c_str(), nprobe);
+        printf ("\n%s | %s-gpu | nprobe=%lu\n", ann_test_name.c_str(), index_key.c_str(), nprobe);
         printf ("============================================================================================\n");
         for (size_t t_nq = 10; t_nq <= NQ; t_nq *= 10) {    // nq = {10, 100, 1000}
             for (size_t t_k = 100; t_k <= K; t_k *= 10) {   //  k = {100, 1000}