diff --git a/python/ray/rllib/agents/agent.py b/python/ray/rllib/agents/agent.py
index 0517e2b09..7169be3a6 100644
--- a/python/ray/rllib/agents/agent.py
+++ b/python/ray/rllib/agents/agent.py
@@ -213,8 +213,8 @@ class Agent(Trainable):
         # Create a default logger creator if no logger_creator is specified
         if logger_creator is None:
             timestr = datetime.today().strftime("%Y-%m-%d_%H-%M-%S")
-            logdir_prefix = "{}_{}_{}".format(
-                self._agent_name, self._env_id, timestr)
+            logdir_prefix = "{}_{}_{}".format(self._agent_name, self._env_id,
+                                              timestr)
 
             def default_logger_creator(config):
                 """Creates a Unified logger with a default logdir prefix