diff --git a/pkgs/development/python-modules/dask/default.nix b/pkgs/development/python-modules/dask/default.nix
index 9c03f6d71654..d69ae77e1a62 100644
--- a/pkgs/development/python-modules/dask/default.nix
+++ b/pkgs/development/python-modules/dask/default.nix
@@ -60,6 +60,7 @@ buildPythonPackage rec {
     "test_argwhere_str"
     "test_count_nonzero_str"
     "rolling_methods"  # floating percision error ~0.1*10^8 small
+    "num_workers_config" # flaky
   ];
 
   meta = {