diff --git a/setup.py b/setup.py
index 65df86c..e38f7cb 100644
--- a/setup.py
+++ b/setup.py
@@ -1,8 +1,9 @@
-from setuptools import Extension, setup
+from setuptools import find_namespace_packages, Extension, setup
 import numpy as np
 
 
 setup(
+    packages=find_namespace_packages(where="."),
     ext_modules=[
         Extension(name="iced._filter_",
                   sources=["iced/_filter_.pyx"],
