diff --git a/tox.ini b/tox.ini
index 97f17b47..2230329e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -71,6 +71,7 @@ per-file-ignores =
     core/utils/__init__.py: F401
     core/plugins/downloaders/configuration.py: F401
     core/plugins/downloaders/utils.py: F401
+    libs/custom/synchronousdeluge/__init__.py: F401
 
 [testenv:check]
 deps =