diff --git a/setup.cfg b/setup.cfg
index aec9318..996e37d 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -7,3 +7,6 @@ versionfile_source = src/wormhole/_version.py
 versionfile_build = wormhole/_version.py
 tag_prefix = 
 parentdir_prefix = magic-wormhole
+
+[flake8]
+max-line-length = 84