diff --git a/patroni/ha.py b/patroni/ha.py
index 283d3678..8ed18b16 100644
--- a/patroni/ha.py
+++ b/patroni/ha.py
@@ -384,7 +384,8 @@ class Ha:
             else:
                 # check if we are allowed to join
                 if self.sysid_valid(self.cluster.initialize) and self.cluster.initialize != self.state_handler.sysid:
-                    logger.fatal("system ID mismatch, node {0} belongs to a different cluster".format(self.state_handler.name))
+                    logger.fatal("system ID mismatch, node {0} belongs to a different cluster".
+                                 format(self.state_handler.name))
                     sys.exit(1)
 
             # try to start dead postgres