diff --git a/pykolab/logger.py b/pykolab/logger.py
--- a/pykolab/logger.py
+++ b/pykolab/logger.py
@@ -267,8 +267,9 @@
         if not self.name.startswith('pykolab') and self.debuglevel != 9:
             return
 
-        if level <= self.debuglevel:
-            self.log(logging.DEBUG, msg)
+        if type(level) == type(self.debuglevel):
+            if level <= self.debuglevel:
+                self.log(logging.DEBUG, msg)
 
 
 logging.setLoggerClass(Logger)