diff --git a/gnu/packages/python-xyz.scm b/gnu/packages/python-xyz.scm
index 7c8fbbc11c..711bd4dac0 100644
--- a/gnu/packages/python-xyz.scm
+++ b/gnu/packages/python-xyz.scm
@@ -6548,22 +6548,12 @@ tasks rather than a standard compliant master implementation.")
       #~(list
          ;; Ignore flaky tests.
          ;; AssertionError: assert None == 100
-         "--deselect=tests/test_core.py::test_incr_update_keyerror")
-      #:phases
-      #~(modify-phases %standard-phases
-          (add-before 'check 'fix-pytest-config
-            (lambda _
-              (substitute* "tox.ini"
-                ;; no python-pytest-xdist
-                ((".*-n auto.*")
-                 "")
-                ;; no python-pytest-cov
-                ((".*--cov.*")
-                 "")))))))
+         "--deselect=tests/test_core.py::test_incr_update_keyerror")))
     (native-inputs
      (list python-django
            python-matplotlib
            python-pytest
+           python-pytest-xdist
            python-setuptools))
     (home-page "https://www.grantjenks.com/docs/diskcache/")
     (synopsis "Disk and file backed cache library")