diff --git a/library/include/ck/library/reference_tensor_operation/cpu/reference_batched_gemm.hpp b/library/include/ck/library/reference_tensor_operation/cpu/reference_batched_gemm.hpp
index 269126432b..46a1fa559a 100644
--- a/library/include/ck/library/reference_tensor_operation/cpu/reference_batched_gemm.hpp
+++ b/library/include/ck/library/reference_tensor_operation/cpu/reference_batched_gemm.hpp
@@ -83,8 +83,8 @@ struct ReferenceBatchedGemm : public device::BaseOperator
             make_ParallelTensorFunctor(f_gmk_gkn_gmn,
                                        arg.c_g_m_n_.mDesc.GetLengths()[0],
                                        arg.c_g_m_n_.mDesc.GetLengths()[1],
-                                       arg.c_g_m_n_.mDesc.GetLengths()[2])();
-
+                                       arg.c_g_m_n_.mDesc.GetLengths()[2])(
+                std::thread::hardware_concurrency());
             return 0;
         }