diff --git a/typings/xterm.d.ts b/typings/xterm.d.ts
index 0b0ce9d5..22446e36 100644
--- a/typings/xterm.d.ts
+++ b/typings/xterm.d.ts
@@ -950,7 +950,7 @@ declare module 'xterm' {
      *
      * @param x The character index to get.
      */
-    getCell(x: number): IBufferCell;
+    getCell(x: number): IBufferCell | undefined;
 
     /**
      * Gets the line as a string. Note that this is gets only the string for the line, not taking