diff --git a/typings/xterm.d.ts b/typings/xterm.d.ts
index 69d345bc..37f169e8 100644
--- a/typings/xterm.d.ts
+++ b/typings/xterm.d.ts
@@ -82,6 +82,11 @@ declare module 'xterm' {
      */
     lineHeight?: number;
 
+    /**
+     * Whether to treat option as the meta key.
+     */
+    macOptionIsMeta?: boolean;
+
     /**
      * The number of rows in the terminal.
      */
@@ -424,7 +429,7 @@ declare module 'xterm' {
      * Retrieves an option's value from the terminal.
      * @param key The option key.
      */
-    getOption(key: 'cancelEvents' | 'convertEol' | 'cursorBlink' | 'debug' | 'disableStdin' | 'enableBold' | 'popOnBell' | 'screenKeys' | 'useFlowControl' | 'visualBell'): boolean;
+    getOption(key: 'cancelEvents' | 'convertEol' | 'cursorBlink' | 'debug' | 'disableStdin' | 'enableBold' | 'macOptionIsMeta' | 'popOnBell' | 'screenKeys' | 'useFlowControl' | 'visualBell'): boolean;
     /**
      * Retrieves an option's value from the terminal.
      * @param key The option key.