diff --git a/tildetown/mustache.py b/tildetown/mustache.py
index be13ea8..0c3f322 100644
--- a/tildetown/mustache.py
+++ b/tildetown/mustache.py
@@ -15,11 +15,16 @@ def slurp(file_path):
         pass
     return contents
 
-def main(argv):
+# when you install scripts with entry_points in a setup.py, the resulting
+# executable just calls main() and you have to look up sys.argv yourself. I like to explicitly take an argv in my actual main, hence the weird indirection. could probably be better.
+def _main(argv):
     template = slurp(argv[1])
     data = json.loads(sys.stdin.read())
     sys.stdout.write(render(template, data))
 
-if __name__ == '__main__':
-    exit(main(sys.argv))
+def main():
+    _main(sys.argv)
+
+if __name__ == '__main__':
+    exit(_main(sys.argv))