diff --git a/app/assets/javascripts/discourse/lib/Markdown.Editor.js b/app/assets/javascripts/discourse/lib/Markdown.Editor.js
index 148ae87c9..c6dbcd279 100644
--- a/app/assets/javascripts/discourse/lib/Markdown.Editor.js
+++ b/app/assets/javascripts/discourse/lib/Markdown.Editor.js
@@ -1365,17 +1365,6 @@
                     case "h":
                         doClick(buttons.heading);
                         break;
-                    case "y":
-                        doClick(buttons.redo);
-                        break;
-                    case "z":
-                        if (key.shiftKey) {
-                            doClick(buttons.redo);
-                        }
-                        else {
-                            doClick(buttons.undo);
-                        }
-                        break;
                     default:
                         return;
                 }