diff --git a/atom/browser/javascript_environment.cc b/atom/browser/javascript_environment.cc
index 421094817a9c..6277bbae4636 100644
--- a/atom/browser/javascript_environment.cc
+++ b/atom/browser/javascript_environment.cc
@@ -73,6 +73,7 @@ void JavascriptEnvironment::OnMessageLoopCreated() {
 void JavascriptEnvironment::OnMessageLoopDestroying() {
   DCHECK(microtasks_runner_);
   base::MessageLoopCurrent::Get()->RemoveTaskObserver(microtasks_runner_.get());
+  platform_->DrainTasks(isolate_);
   platform_->UnregisterIsolate(isolate_);
 }