diff --git a/src/conftest.py b/src/conftest.py
index f4f8f50..95965d6 100644
--- a/src/conftest.py
+++ b/src/conftest.py
@@ -37,7 +37,7 @@ def dirmanager(request) -> DirManager:
     tests_dir = Path(tests_dir)
     session_id = request.config.getoption("--session_id")
     assert session_id is not None, "required pytest command line argument not given"
-    dirmanager = DirManager(tests_dir=tests_dir, session_id=session_id)
+    dirmanager = DirManager(output_dir=tests_dir, session_id=session_id)
     dirmanager.create_all_dirs()
     return dirmanager