diff --git a/pkgs/development/python-modules/formulae/default.nix b/pkgs/development/python-modules/formulae/default.nix
index c08e987a7b65..1e4479f620b4 100644
--- a/pkgs/development/python-modules/formulae/default.nix
+++ b/pkgs/development/python-modules/formulae/default.nix
@@ -37,11 +37,15 @@ buildPythonPackage rec {
   ];
 
   nativeCheckInputs = [ pytestCheckHook ];
-  # use assertions of form `assert pytest.approx(...)`, which is now disallowed:
+
   disabledTests = [
+    # use assertions of form `assert pytest.approx(...)`, which is now disallowed:
     "test_basic"
     "test_degree"
+    # AssertionError
+    "test_evalenv_equality"
   ];
+
   pythonImportsCheck = [
     "formulae"
     "formulae.matrices"