diff --git a/lisp/emacs-lisp/lisp-mode.el b/lisp/emacs-lisp/lisp-mode.el
index 1992214ccf43..a66d553d93a1 100644
--- a/lisp/emacs-lisp/lisp-mode.el
+++ b/lisp/emacs-lisp/lisp-mode.el
@@ -156,6 +156,7 @@ ine-condition\\|ine-widget\\|face\\)\\s-+'?\\(\\sw\\(\\sw\\|\\s_\\)+\\)")
 
 (defvar lisp-mode-shared-map
   (let ((map (make-sparse-keymap)))
+    (define-key map "\t" 'lisp-indent-line)
     (define-key map "\e\C-q" 'indent-sexp)
     (define-key map "\177" 'backward-delete-char-untabify)
     ;; This gets in the way when viewing a Lisp file in view-mode.  As