diff --git a/gnu/packages/python-xyz.scm b/gnu/packages/python-xyz.scm
index 6ba6a6ad1c9..6cb8c0c58e3 100644
--- a/gnu/packages/python-xyz.scm
+++ b/gnu/packages/python-xyz.scm
@@ -31828,22 +31828,18 @@ we can stop writing custom parsers for syslog-type records.")
     (name "python-unique-log-filter")
     (version "0.1.0")
     (source
-     ;; The version on pypi does not include test files.
      (origin
        (method git-fetch)
        (uri (git-reference
-             (url "https://github.com/twizmwazin/unique_log_filter")
-             (commit (string-append "v" version))))
+              (url "https://github.com/twizmwazin/unique_log_filter")
+              (commit (string-append "v" version))))
        (file-name (git-file-name name version))
        (sha256
         (base32 "036mh6nqskck2fa1q2inasqxb9wcz2p09qcpldnnffzcy1a6kzba"))))
     (build-system pyproject-build-system)
     (arguments
-     `(#:phases (modify-phases %standard-phases
-                  (replace 'check
-                    (lambda* (#:key tests? #:allow-other-keys)
-                      (when tests?
-                        (invoke "python" "test_unique_log_filter.py")))))))
+     (list #:test-backend #~'custom
+           #:test-flags #~(list "test_unique_log_filter.py")))
     (native-inputs (list python-flit-core))
     (home-page "https://github.com/twizmwazin/unique_log_filter")
     (synopsis "Log filter that removes duplicate log messages")