diff --git a/tabby-terminal/src/frontends/xtermFrontend.ts b/tabby-terminal/src/frontends/xtermFrontend.ts
index b44a393f..66d243c9 100644
--- a/tabby-terminal/src/frontends/xtermFrontend.ts
+++ b/tabby-terminal/src/frontends/xtermFrontend.ts
@@ -138,7 +138,7 @@ export class XTermFrontend extends Frontend {
             }
         }
 
-        const oldKeyUp = this.xtermCore._keyUp
+        const oldKeyUp = this.xtermCore._keyUp.bind(this.xtermCore)
         this.xtermCore._keyUp = (e: KeyboardEvent) => {
             this.xtermCore.updateCursorStyle(e)
             if (keyboardEventHandler('keyup', e)) {