diff --git a/src/vs/platform/telemetry/test/electron-browser/appInsightsAppender.test.ts b/src/vs/platform/telemetry/test/electron-browser/appInsightsAppender.test.ts
index ee732ab653f4df753d9a118331ac26664a1e1940..92f9d63b15ecef4a4c85d72c1ed3cc0b6ce82b0f 100644
--- a/src/vs/platform/telemetry/test/electron-browser/appInsightsAppender.test.ts
+++ b/src/vs/platform/telemetry/test/electron-browser/appInsightsAppender.test.ts
@@ -84,7 +84,7 @@ suite('AIAdapter', () => {
 	});
 
 	teardown(() => {
-		return adapter.flush();
+		adapter.flush();
 	});
 
 	test('Simple event', () => {