diff --git a/cpp/tests/linalg/eigen_solvers.cu b/cpp/tests/linalg/eigen_solvers.cu
index cf75ff89bf..e18b3a9f29 100644
--- a/cpp/tests/linalg/eigen_solvers.cu
+++ b/cpp/tests/linalg/eigen_solvers.cu
@@ -46,7 +46,7 @@ TEST(Raft, EigenSolvers)
   index_type nnz   = 0;
   index_type nrows = 0;
 
-  sparse_matrix_t<index_type, value_type> sm1{h, ro, ci, vs, nrows, nnz};
+  sparse_matrix_t<index_type, value_type> sm1{h, ro, ci, vs, nrows, static_cast<uint64_t>(nnz)};
   ASSERT_EQ(nullptr, sm1.row_offsets_);
 
   index_type neigvs{10};
diff --git a/cpp/tests/sparse/solver/lanczos.cu b/cpp/tests/sparse/solver/lanczos.cu
index 23b3a7ff99..2f5de6870d 100644
--- a/cpp/tests/sparse/solver/lanczos.cu
+++ b/cpp/tests/sparse/solver/lanczos.cu
@@ -173,7 +173,7 @@ class rmat_lanczos_tests
       raft::make_device_vector<IndexType, uint32_t, raft::row_major>(handle,
                                                                      symmetric_coo.n_rows + 1);
     raft::sparse::convert::sorted_coo_to_csr(symmetric_coo.rows(),
-                                             (IndexType)symmetric_coo.nnz,
+                                             static_cast<int>(symmetric_coo.nnz),
                                              row_indices.data_handle(),
                                              symmetric_coo.n_rows + 1,
                                              stream);
@@ -198,7 +198,7 @@ class rmat_lanczos_tests
       symmetric_coo.cols(),
       symmetric_coo.vals(),
       symmetric_coo.n_rows,
-      (IndexType)symmetric_coo.nnz};
+      symmetric_coo.nnz};
     raft::sparse::solver::lanczos_solver_config<ValueType> config{
       n_components, params.maxiter, params.restartiter, params.tol, rng.seed};
 
diff --git a/cpp/tests/sparse/spectral_matrix.cu b/cpp/tests/sparse/spectral_matrix.cu
index 52f7eff10e..f37af32fb9 100644
--- a/cpp/tests/sparse/spectral_matrix.cu
+++ b/cpp/tests/sparse/spectral_matrix.cu
@@ -55,7 +55,7 @@ TEST(Raft, SpectralMatrices)
   value_type* vs{nullptr};
   index_type nnz   = 0;
   index_type nrows = 0;
-  sparse_matrix_t<index_type, value_type> sm1{h, ro, ci, vs, nrows, nnz};
+  sparse_matrix_t<index_type, value_type> sm1{h, ro, ci, vs, nrows, static_cast<uint64_t>(nnz)};
   sparse_matrix_t<index_type, value_type> sm2{h, csr_v};
   ASSERT_EQ(nullptr, sm1.row_offsets_);
   ASSERT_EQ(nullptr, sm2.row_offsets_);