diff --git a/morituri/program/cdparanoia.py b/morituri/program/cdparanoia.py
index 46176d54..86913a6e 100644
--- a/morituri/program/cdparanoia.py
+++ b/morituri/program/cdparanoia.py
@@ -486,7 +486,7 @@ def __init__(self, path, table, start, stop, offset=0, device=None,
 
         umask = os.umask(0)
         os.umask(umask)
-        self.file_mode = 0666 - umask
+        self.file_mode = 0666 & ~ umask
 
     def stop(self):
         # FIXME: maybe this kind of try-wrapping to make sure