diff --git a/setup.cfg b/setup.cfg
index 22738c2..7091469 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -54,6 +54,7 @@ exclude =
 flake8_import_order.styles =
     cryptography = flake8_import_order.styles:Cryptography
     google = flake8_import_order.styles:Google
+    isort = flake8_import_order.styles:ISort
     pep8 = flake8_import_order.styles:PEP8
     smarkets = flake8_import_order.styles:Smarkets
     appnexus = flake8_import_order.styles:AppNexus