diff --git a/testgres/node.py b/testgres/node.py
index 81866e89..5835541d 100644
--- a/testgres/node.py
+++ b/testgres/node.py
@@ -40,7 +40,8 @@
     MAX_REPLICATION_SLOTS, \
     MAX_WORKER_PROCESSES, \
     MAX_WAL_SENDERS, \
-    WAL_KEEP_SEGMENTS
+    WAL_KEEP_SEGMENTS, \
+    WAL_KEEP_SIZE
 
 from .decorators import \
     method_decorator, \
@@ -525,8 +526,8 @@ def get_auth_method(t):
                                  wal_level=wal_level)  # yapf: disable
             else:
                 self.append_conf(hot_standby=True,
-                        wal_keep_size=WAL_KEEP_SIZE,
-                        wal_level=wal_level)  # yapf: disable
+                                 wal_keep_size=WAL_KEEP_SIZE,
+                                 wal_level=wal_level)  # yapf: disable
 
         # logical replication
         if allow_logical:
diff --git a/testgres/utils.py b/testgres/utils.py
index 6c6f0e9b..47228e60 100644
--- a/testgres/utils.py
+++ b/testgres/utils.py
@@ -79,7 +79,7 @@ def execute_utility(args, logfile=None):
 
                 if out:
                     # comment-out lines
-                    lines = ('# ' + l for l in out.splitlines(True))
+                    lines = ('# ' + line for line in out.splitlines(True))
                     file_out.write(u'\n')
                     file_out.writelines(lines)