diff --git a/.isort.cfg b/.isort.cfg
index 3abd607e75..2cf4d9ebc2 100644
--- a/.isort.cfg
+++ b/.isort.cfg
@@ -1,6 +1,6 @@
 [settings]
 multi_line_output = 3
-known_third_party = netifaces, tc_aws, thumbor
+known_third_party = decorator, jinja2, netifaces, tc_aws, stripe, thumbor, tornado, zulip
 include_trailing_comma = True
 use_parentheses = True
 line_length = 100