diff --git a/setup.cfg b/setup.cfg
index 54d7376..4635543 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -7,7 +7,8 @@ addopts = --tb=short
 
 [flake8]
 # E731: Use a def instead of lambda expr
-ignore = E731
+# E743: Ambiguous function definition
+ignore = E731, E743
 select = C,E,F,W,B,B9
 exclude = .eggs, tests/storage/servers/owncloud/, tests/storage/servers/nextcloud/, tests/storage/servers/baikal/, build/
 application-package-names = tests,vdirsyncer