1 files changed, 7 insertions, 6 deletions

diff --git a/lisp/ediff.el b/lisp/ediff.el
index d1a77115548..1d1da6a1930 100644
--- a/lisp/ediff.el
+++ b/lisp/ediff.el
@@ -1691,7 +1691,7 @@ rcs.el and want to use it instead of the standard vc.el.
 Note: both packages provide access to RCS, but only vc.el comes with Emacs
 distribution.")
 
-(defvar ediff-revision-key "="
+(defvar ediff-revision-key nil
   "Key to which `ediff-revision' is to be bound.")
   
 (defvar ediff-use-last-dir nil
@@ -2556,11 +2556,12 @@ and `ediff-revision-key' for customization.")))
           (progn
             (message "") ; kill the message from `locate-library'
             (require ediff-version-control-package)
-            (define-key
-              (cond ((eq ediff-version-control-package 'vc) vc-prefix-map)
-                    ((eq ediff-version-control-package 'rcs) global-map)
-                    (t  global-map))
-              ediff-revision-key 'ediff-revision))
+            (if ediff-revision-key
+                (define-key
+                  (cond ((eq ediff-version-control-package 'vc) vc-prefix-map)
+                        ((eq ediff-version-control-package 'rcs) global-map)
+                        (t  global-map))
+                  ediff-revision-key 'ediff-revision)))
         (or silent
             (error "Version control package %S.el not found. Use vc.el instead" 
                    ediff-version-control-package)))))