diff --git a/gnu/packages/python-xyz.scm b/gnu/packages/python-xyz.scm
index 6161792e6d4..dd0ad272382 100644
--- a/gnu/packages/python-xyz.scm
+++ b/gnu/packages/python-xyz.scm
@@ -20866,6 +20866,7 @@ for the module to work under Python 3.3.")
 text.")
    (license license:bsd-3)))
 
+;; XXX: Not maintained since 2012.
 (define-public python-monthdelta
   (package
     (name "python-monthdelta")
@@ -20877,7 +20878,9 @@ text.")
        (sha256
         (base32 "0iwcsk7ryjw5h1wp10ykwd01f3am8gdlga6461q1v1njsk0rxh41"))))
     (build-system pyproject-build-system)
-    (native-inputs (list python-setuptools python-wheel))
+    (arguments
+     (list #:test-backend #~'unittest))
+    (native-inputs (list python-setuptools))
     (home-page "http://packages.python.org/MonthDelta")
     (synopsis "Date computations with months")
     (description