diff --git a/pomice/pool.py b/pomice/pool.py
index 88d8701..4d1056c 100644
--- a/pomice/pool.py
+++ b/pomice/pool.py
@@ -233,6 +233,7 @@ class Node:
             handler.setFormatter(formatter)
 
         if handler:
+            logger.handlers.clear()
             logger.addHandler(handler)
 
         return logger