diff --git a/mammoth/translate/translation_server.py b/mammoth/translate/translation_server.py
index 75284bbd..d96bc784 100644
--- a/mammoth/translate/translation_server.py
+++ b/mammoth/translate/translation_server.py
@@ -408,8 +408,8 @@ def parse_opt(self, opts):
                 if type(v) is str:
                     sys.argv += ['-transforms', v]
                 else:
-                   assert type(v) is list
-                   sys.argv += ['-transforms', *v]
+                    assert type(v) is list
+                    sys.argv += ['-transforms', *v]
             else:
                 sys.argv += ['-%s' % k, str(v)]