diff --git a/Sudo/plugin.py b/Sudo/plugin.py
index d646a0c..93df103 100644
--- a/Sudo/plugin.py
+++ b/Sudo/plugin.py
@@ -217,7 +217,7 @@ class Sudo(callbacks.Plugin):
                 os.unlink(self._path)
             except OSError:
                 pass
-            self.db.save(open(self._path, 'au'))
+            self.db.save(open(self._path, 'a'))
         callbacks.Plugin.die(self)