diff --git a/pkgs/applications/audio/quodlibet/default.nix b/pkgs/applications/audio/quodlibet/default.nix
index 454bd58c5177..01159d75be44 100644
--- a/pkgs/applications/audio/quodlibet/default.nix
+++ b/pkgs/applications/audio/quodlibet/default.nix
@@ -148,6 +148,8 @@ python3.pkgs.buildPythonApplication rec {
     "--deselect=tests/test_browsers_iradio.py::TInternetRadio::test_click_add_station"
     # upstream does actually not enforce source code linting
     "--ignore=tests/quality"
+    # marked as flaky, breaks in sandbox
+    "--deselect=tests/test_library_file.py::TWatchedFileLibrary::test_watched_adding"
   ]
   ++ lib.optionals (withXineBackend || !withGstPlugins) [
     "--ignore=tests/plugin/test_replaygain.py"