diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 896d08ea163..499eaea9cb6 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,9 @@
+2011-11-23  Eli Zaretskii  <eliz@gnu.org>
+
+	* emacs-lisp/autoload.el (autoload-generate-file-autoloads): On
+	MS-DOS and MS-Windows, compare with loaddefs.el
+	case-insensitively.
+
 2011-11-23  Mark Lillibridge  <mark.lillibridge@hp.com>  (tiny change)
 
 	* mail/unrmail.el (unrmail): Always add blank line.  (Bug#7743)
diff --git a/lisp/emacs-lisp/autoload.el b/lisp/emacs-lisp/autoload.el
index df98271832a..19a4d44273d 100644
--- a/lisp/emacs-lisp/autoload.el
+++ b/lisp/emacs-lisp/autoload.el
@@ -446,7 +446,11 @@ Return non-nil if and only if FILE adds no autoloads to OUTFILE
 		    generated-autoload-load-name
 		  (autoload-file-load-name absfile)))
           (when (and outfile
-                     (not (equal outfile (autoload-generated-file))))
+                     (not
+		      (if (memq system-type '(ms-dos windows-nt))
+			  (equal (downcase outfile)
+				 (downcase (autoload-generated-file)))
+			(equal outfile (autoload-generated-file)))))
             (setq otherbuf t))
           (save-excursion
             (save-restriction