diff --git a/tox.ini b/tox.ini
index 0d85779c..2d50b08c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -15,7 +15,7 @@ select = B,C,E,F,W,T4,B9
 
 [isort]
 force_sort_within_sections=True
-known_third_party=hypothesis,pytest,async_generator,cytoolz,trio_typing,pytest_trio
+known_third_party=pytest,p2pclient
 multi_line_output=3
 include_trailing_comma=True
 force_grid_wrap=0