diff --git a/tests/upgrade_app/test_filter_out_child_files.py b/tests/upgrade_app/test_filter_out_child_files.py
index cb64e38..28a3637 100644
--- a/tests/upgrade_app/test_filter_out_child_files.py
+++ b/tests/upgrade_app/test_filter_out_child_files.py
@@ -15,7 +15,7 @@
             ["document.txt"],
         ),
         (
-            ["input", str(Path("input").joinpath("other")), str(Path("input") / "other"/ "other")],
+            ["input", str(Path("input").joinpath("other")), str(Path("input") / "other" / "other")],
             ["input"],
         ),
         (