diff --git a/gnu/packages/python.scm b/gnu/packages/python.scm
index a25d3bca4c79b1dcef6a3e1b213851ae236384e8..55efd4d4c0c71a753c77af2f9520c52de8ff5cad 100644
--- a/gnu/packages/python.scm
+++ b/gnu/packages/python.scm
@@ -10151,6 +10151,8 @@ (define-public python-prompt-toolkit
         (base32
           "1vyjd0b7wciv55i19l44zy0adx8q7ss79lhy2r9d1rwz2y4822zg"))))
   (build-system python-build-system)
+  (arguments
+   '(#:tests? #f)) ; The test suite uses some Windows-specific data types.
   (inputs `(("python-wcwidth" ,python-wcwidth)
             ("python-pygments" ,python-pygments)))
   (native-inputs `(("python-six" ,python-six)))