diff --git a/setup.py b/setup.py
index 395f83c..c67fa02 100644
--- a/setup.py
+++ b/setup.py
@@ -15,6 +15,7 @@
         'include/pybind11/detail/class.h',
         'include/pybind11/detail/common.h',
         'include/pybind11/detail/descr.h',
+        'include/pybind11/detail/init.h',
         'include/pybind11/detail/typeid.h'
         'include/pybind11/attr.h',
         'include/pybind11/buffer_info.h',