diff --git a/Makefile b/Makefile
index 69ad7d1..cd3e661 100644
--- a/Makefile
+++ b/Makefile
@@ -8,7 +8,10 @@ env: requirements_tests.txt
 	./env/bin/pip3 install -r requirements_tests.txt
 	./env/bin/pip2 install -r requirements_tests.txt
 
-dist:
+chmod:
+	git ls-files -z | xargs -0 chmod u=rwX,g=rX,o=rX
+
+dist: chmod
 	python3 setup.py sdist bdist_wheel
 	python2 setup.py sdist
 
@@ -22,5 +25,5 @@ test: env
 
 tests: test
 
-upload:
+upload: chmod
 	python3 setup.py sdist bdist_wheel upload
diff --git a/setup.py b/setup.py
index f24be07..904ed60 100644
--- a/setup.py
+++ b/setup.py
@@ -1,9 +1,12 @@
+import os
 from os.path import join, dirname
 
 from setuptools import setup, find_packages
 
 from version import get_version
 
+os.umask(2)
+
 setup(
     name='libarchive-c',
     version=get_version(),