diff --git a/test/lisp/progmodes/python-tests.el b/test/lisp/progmodes/python-tests.el
index af6c199b5bd..3393f93542b 100644
--- a/test/lisp/progmodes/python-tests.el
+++ b/test/lisp/progmodes/python-tests.el
@@ -4883,6 +4883,7 @@ python-shell-completion-at-point-ipython
     (python-tests-with-temp-buffer-with-shell
      ""
      (python-shell-with-shell-buffer
+       (make-temp-file "my-py-out-" nil ".txt" (buffer-string))
        (python-shell-completion-native-turn-off)
        (python-tests--completion-module)
        (python-tests--completion-parameters)