diff -r 1d72402c1c91 Lib/logging/config.py
--- a/Lib/logging/config.py	Tue Mar 15 13:33:28 2016 +1300
+++ b/Lib/logging/config.py	Tue Mar 15 00:37:06 2016 -0400
@@ -795,7 +795,7 @@
     dictConfigClass(config).configure()
 
 
-def listen(port=DEFAULT_LOGGING_CONFIG_PORT, verify=None):
+def listen(port=DEFAULT_LOGGING_CONFIG_PORT, verify=None, disable_existing_loggers=True):
     """
     Start up a socket server on the specified port, and listen for new
     configurations.
@@ -854,7 +854,7 @@
 
                             file = io.StringIO(chunk)
                             try:
-                                fileConfig(file)
+                                fileConfig(file, disable_existing_loggers = disable_existing_loggers)
                             except Exception:
                                 traceback.print_exc()
                     if self.server.ready: