diff --git a/python/src/mapreduce/base_handler.py b/python/src/mapreduce/base_handler.py
index 8f77480d..17f358f4 100755
--- a/python/src/mapreduce/base_handler.py
+++ b/python/src/mapreduce/base_handler.py
@@ -128,7 +128,7 @@ def initialize(self, request, response):
     # pylint: disable=bare-except
     except:
       self._preprocess_success = False
-      logging.error(
+      logging.exception(
           "Preprocess task %s failed. Dropping it permanently.",
           self.request.headers["X-AppEngine-TaskName"])
       self._drop_gracefully()