(normal-backup-enable-predicate): Correct

interpretation of the return value of compare-strings.

1 files changed, 2 insertions, 2 deletions

diff --git a/lisp/files.el b/lisp/files.el
index 7dd82e6f2fb..0da412b91a2 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -141,14 +141,14 @@ Checks for files in `temporary-file-directory' or
                                         name 0 nil)))
              ;; Directory is under temporary-file-directory.
              (and (not (eq comp t))
-                  (< comp -1)))
+                  (< comp (- (length temporary-file-directory)))))
            (if small-temporary-file-directory
                (let ((comp (compare-strings small-temporary-file-directory
                                             0 nil
                                             name 0 nil)))
                  ;; Directory is under small-temporary-file-directory.
                  (and (not (eq comp t))
-                      (< comp -1)))))))
+                      (< comp (- (length small-temporary-file-directory)))))))))
 
 (defvar backup-enable-predicate 'normal-backup-enable-predicate
   "Predicate that looks at a file name and decides whether to make backups.