diff --git a/pkgs/development/python-modules/filelock/default.nix b/pkgs/development/python-modules/filelock/default.nix
index c56a4991a173..56ad94f59d56 100644
--- a/pkgs/development/python-modules/filelock/default.nix
+++ b/pkgs/development/python-modules/filelock/default.nix
@@ -41,6 +41,7 @@ buildPythonPackage (finalAttrs: {
     "tests/test_virtualenv.py"
     # Very prone to timeouts on busy machines
     "tests/test_filelock.py"
+    "tests/test_read_write.py"
   ];
 
   meta = {