diff --git a/lisp/emacs-lisp/ert-x.el b/lisp/emacs-lisp/ert-x.el
index a6d2fe4a1da..cd60f9f457f 100644
--- a/lisp/emacs-lisp/ert-x.el
+++ b/lisp/emacs-lisp/ert-x.el
@@ -540,7 +540,7 @@ The same keyword arguments are supported as in
 (when (and (featurep 'tramp) (getenv "EMACS_HYDRA_CI"))
   (add-to-list 'tramp-remote-path 'tramp-own-remote-path))
 
-;; If this defconst is used in a test file, `tramp' shall be loaded
+;; If this defvar is used in a test file, `tramp' shall be loaded
 ;; prior `ert-x'.  There is no default value on w32 systems, which
 ;; could work out of the box.
 (defvar ert-remote-temporary-file-directory
diff --git a/test/lisp/net/tramp-tests.el b/test/lisp/net/tramp-tests.el
index 3216a8be1b0..91b0542c759 100644
--- a/test/lisp/net/tramp-tests.el
+++ b/test/lisp/net/tramp-tests.el
@@ -134,7 +134,7 @@ A resource file is in the resource directory as per
   (eval-and-compile
     ;; There is no default value on w32 systems, which could work out
     ;; of the box.
-    (defconst ert-remote-temporary-file-directory
+    (defvar ert-remote-temporary-file-directory
       (cond
        ((getenv "REMOTE_TEMPORARY_FILE_DIRECTORY"))
        ((eq system-type 'windows-nt) null-device)