diff --git a/notebook/static/notebook/js/keyboardmanager.js b/notebook/static/notebook/js/keyboardmanager.js
index 21138b4ee..37d8e0b06 100644
--- a/notebook/static/notebook/js/keyboardmanager.js
+++ b/notebook/static/notebook/js/keyboardmanager.js
@@ -79,7 +79,6 @@ define([
             'up'                  : 'jupyter-notebook:move-cursor-up',
             'down'                : 'jupyter-notebook:move-cursor-down',
             'ctrl-shift--'        : 'jupyter-notebook:split-cell-at-cursor',
-            'ctrl-shift-subtract' : 'jupyter-notebook:split-cell-at-cursor',
         };
     };