diff --git a/dddp/alea.py b/dddp/alea.py
old mode 100755
new mode 100644
index b8a91ee..4b0bd42
--- a/dddp/alea.py
+++ b/dddp/alea.py
@@ -160,8 +160,3 @@ class Alea(object):
     def hex_string(self, digits):
         """Return a hex string of `digits` length."""
         return self.random_string(digits, '0123456789abcdef')
-
-
-if __name__ == '__main__':
-    import doctest
-    doctest.testmod()