diff --git a/setup.cfg b/setup.cfg
index 5eab412..3e867f8 100755
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,2 +1,5 @@
 [bdist_wheel]
-universal=1
+universal = 1
+
+[sdist]
+formats = gztar
diff --git a/setup.py b/setup.py
index 42ffdf4..7545637 100755
--- a/setup.py
+++ b/setup.py
@@ -27,6 +27,7 @@
         "PyRSS2Gen",
         ],
     packages=["devpi_rss"],
+    zip_safe=False,
     include_package_data=True,
     entry_points={"devpi_server": ["devpi-rss=devpi_rss"]},
 )