diff --git a/phono3py/phonon3/fc3.py b/phono3py/phonon3/fc3.py
index 92401242..cd025234 100644
--- a/phono3py/phonon3/fc3.py
+++ b/phono3py/phonon3/fc3.py
@@ -546,13 +546,17 @@ def show_drift_fc3(fc3,
     else:
         try:
             import phono3py._phono3py as phono3c
-            s2p_map = primitive.get_supercell_to_primitive_map()
-            p2s_map = primitive.get_primitive_to_supercell_map()
-            p2p_map = primitive.get_primitive_to_primitive_map()
+            s2p_map = primitive.s2p_map
+            p2s_map = primitive.p2s_map
+            p2p_map = primitive.p2p_map
             permutations = primitive.get_atomic_permutations()
             s2pp_map, nsym_list = get_nsym_list_and_s2pp(s2p_map,
                                                          p2p_map,
                                                          permutations)
+            permutations = np.array(permutations, dtype='int_', order='C')
+            s2pp_map = np.array(s2pp_map, dtype='int_')
+            p2s_map = np.array(p2s_map, dtype='int_')
+            nsym_list = np.array(nsym_list, dtype='int_')
             num_patom = fc3.shape[0]
             num_satom = fc3.shape[1]
             maxval1 = 0
diff --git a/phono3py/phonon3/joint_dos.py b/phono3py/phonon3/joint_dos.py
index 5b0b63fe..1fc9b0bc 100644
--- a/phono3py/phonon3/joint_dos.py
+++ b/phono3py/phonon3/joint_dos.py
@@ -70,7 +70,7 @@ class JointDos(object):
                  lapack_zheev_uplo='L'):
 
         self._grid_point = None
-        self._mesh = np.array(mesh, dtype='intc')
+        self._mesh = np.array(mesh, dtype='int_')
         self._primitive = primitive
         self._supercell = supercell
         self._fc2 = fc2