diff --git a/src/browser/CoreBrowserTerminal.ts b/src/browser/CoreBrowserTerminal.ts
index 62ff36c29..6793266f6 100644
--- a/src/browser/CoreBrowserTerminal.ts
+++ b/src/browser/CoreBrowserTerminal.ts
@@ -643,7 +643,7 @@ export class CoreBrowserTerminal extends CoreTerminal implements ITerminal {
 
     // Listen for mouse events and translate
     // them into terminal mouse protocols.
-    this._mouseService!.bindMouse({
+    this._mouseService.bindMouse({
       element: this.element!,
       screenElement: this.screenElement!,
       document: this._document!