diff --git a/.isort.cfg b/.isort.cfg
index 63f5b73..badf815 100644
--- a/.isort.cfg
+++ b/.isort.cfg
@@ -2,6 +2,6 @@
 check=1
 diff=1
 known_third_party=dateutil,pytest,pytz,six,requests
-known_first_party=stix2
+known_first_party=stix2,stix2patterns
 not_skip=__init__.py
 force_sort_within_sections=1