diff --git a/src/Terminal.ts b/src/Terminal.ts
index cd44e7fb..43d42fbe 100644
--- a/src/Terminal.ts
+++ b/src/Terminal.ts
@@ -1358,18 +1358,6 @@ export class Terminal extends EventEmitter implements ITerminal, IInputHandlingT
     this.write(data + '\r\n');
   }
 
-  /**
-   * DEPRECATED: only for backward compatibility. Please use attachCustomKeyEventHandler() instead.
-   * @param {function} customKeydownHandler The custom KeyboardEvent handler to attach. This is a
-   *   function that takes a KeyboardEvent, allowing consumers to stop propogation and/or prevent
-   *   the default action. The function returns whether the event should be processed by xterm.js.
-   */
-  public attachCustomKeydownHandler(customKeydownHandler: CustomKeyEventHandler): void {
-    const message = 'attachCustomKeydownHandler() is DEPRECATED and will be removed soon. Please use attachCustomKeyEventHandler() instead.';
-    console.warn(message);
-    this.attachCustomKeyEventHandler(customKeydownHandler);
-  }
-
   /**
    * Attaches a custom key event handler which is run before keys are processed, giving consumers of
    * xterm.js ultimate control as to what keys should be processed by the terminal and what keys
diff --git a/src/test/test.js b/src/test/test.js
index 5c4dd5f2..df1dab4b 100644
--- a/src/test/test.js
+++ b/src/test/test.js
@@ -239,7 +239,7 @@ describe('xterm.js', function() {
           xterm.writeln('test');
         }
         var startYDisp = (xterm.rows * 2) + 1;
-        xterm.attachCustomKeydownHandler(function () {
+        xterm.attachCustomKeyEventHandler(function () {
           return false;
         });