diff --git a/setup.py b/setup.py
index <HASH>..<HASH> 100644
--- a/setup.py
+++ b/setup.py
@@ -220,6 +220,7 @@ sources_phono3py = ['c/_phono3py.c',
                     'c/real_self_energy.c',
                     'c/real_to_reciprocal.c',
                     'c/reciprocal_to_normal.c',
+                    'c/rgrid.c',
                     'c/tetrahedron_method.c',
                     'c/triplet.c',
                     'c/triplet_iw.c',
Include forgotten file of rgrid.c in setup.py