diff --git a/m/log.py b/m/log.py
index 1acd44a..08ca6d0 100644
--- a/m/log.py
+++ b/m/log.py
@@ -33,6 +33,11 @@ class SingleLevelFilter(logging.Filter):
         """
         self.passlevel = passlevel
         self.reject = reject
+    def filter(self, record):
+         if self.reject:
+             return (record.levelno != self.passlevel)
+         else:
+             return (record.levelno == self.passlevel)
 
 class Log(object):
     """