diff --git a/src/plugins/launchnavigator.ts b/src/plugins/launchnavigator.ts
index 8d3d2fc49f..c5f5b28306 100644
--- a/src/plugins/launchnavigator.ts
+++ b/src/plugins/launchnavigator.ts
@@ -84,7 +84,7 @@ export class LaunchNavigator {
   })
   static navigate(
     destination: any,
-    start?: any = null,
+    start: any = null,
     options?: launchNavigatorOptions
   ): Promise<any> { return }