diff --git a/tests/conftest.py b/tests/conftest.py
index eaca724ca420f7951c7ac2650b8a41ff3dc76049..8a8cbe8fd8caf39882e6b47992f67995e9d543fc 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -54,7 +54,8 @@ def argv_handler(request):
 def wordlists_dir(request, monkeypatch, tmpdir):
     """This fixture provides a temporary wordlist dir.
     """
-    monkeypatch.setattr("diceware.wordlist.get_wordlists_dir", lambda: str(tmpdir))
+    monkeypatch.setattr(
+            "diceware.wordlist.get_wordlists_dir", lambda: str(tmpdir))
     return tmpdir