diff --git a/pkgs/development/python-modules/immutabledict/default.nix b/pkgs/development/python-modules/immutabledict/default.nix
index d341e26d1e3d..0f8426de29ba 100644
--- a/pkgs/development/python-modules/immutabledict/default.nix
+++ b/pkgs/development/python-modules/immutabledict/default.nix
@@ -27,6 +27,11 @@ buildPythonPackage rec {
 
   nativeCheckInputs = [ pytestCheckHook ];
 
+  disabledTests = [
+    # fails if builder load is highly variable
+    "test_performance"
+  ];
+
   meta = with lib; {
     description = "Fork of frozendict, an immutable wrapper around dictionaries";
     homepage = "https://github.com/corenting/immutabledict";