(shell-mode): Don't assume /dev/null is its own truename.

1 files changed, 2 insertions, 1 deletions

diff --git a/lisp/shell.el b/lisp/shell.el
index 9d732bd3fd9..1d4dfcef3c1 100644
--- a/lisp/shell.el
+++ b/lisp/shell.el
@@ -357,7 +357,8 @@ buffer."
                     ((string-equal shell "ksh") "~/.sh_history")
                     (t "~/.history"))))
     (if (or (equal comint-input-ring-file-name "")
-            (equal (file-truename comint-input-ring-file-name) "/dev/null"))
+            (equal (file-truename comint-input-ring-file-name)
+                   (file-truename "/dev/null")))
         (setq comint-input-ring-file-name nil))
     (setq shell-dirstack-query
           (cond ((string-equal shell "sh") "pwd")