diff --git a/setup.py b/setup.py
index e82240a33347bca17274f3b0fe39dbc2efe75f13..f012e0f67073c50c612bd7b97377dc08cc37c847 100644
--- a/setup.py
+++ b/setup.py
@@ -52,5 +52,7 @@ setup(name="pymbolic",
       install_requires=[
           'pytools>=2'
           ],
-      package_dir={"pymbolic": "src", "pymbolic.mapper":"src/mapper"}
+      package_dir={"pymbolic": "src", "pymbolic.mapper":"src/mapper"},
+
+      zip_safe=False,
      )