diff --git a/src/lib/QtGui/QEvent/QMouseEvent.ts b/src/lib/QtGui/QEvent/QMouseEvent.ts
index ab77d624a..197d95468 100644
--- a/src/lib/QtGui/QEvent/QMouseEvent.ts
+++ b/src/lib/QtGui/QEvent/QMouseEvent.ts
@@ -6,7 +6,7 @@ export class QMouseEvent {
     constructor(event: NativeElement) {
         this.native = new addon.QMouseEvent(event);
     }
-    button(): string {
+    button(): number {
         return this.native.button();
     }
     x(): number {