diff --git a/src/node_platform.cc b/src/node_platform.cc
index a8258ed74b120f..fdca115e5f8f03 100644
--- a/src/node_platform.cc
+++ b/src/node_platform.cc
@@ -141,6 +141,7 @@ void NodePlatform::RegisterIsolate(IsolateData* isolate_data, uv_loop_t* loop) {
   Mutex::ScopedLock lock(per_isolate_mutex_);
   std::shared_ptr<PerIsolatePlatformData> existing = per_isolate_[isolate];
   if (existing) {
+    CHECK_EQ(loop, existing->event_loop());
     existing->ref();
   } else {
     per_isolate_[isolate] =
diff --git a/src/node_platform.h b/src/node_platform.h
index cf0809ad1f673b..f6a177c9242324 100644
--- a/src/node_platform.h
+++ b/src/node_platform.h
@@ -72,6 +72,8 @@ class PerIsolatePlatformData :
   bool FlushForegroundTasksInternal();
   void CancelPendingDelayedTasks();
 
+  const uv_loop_t* event_loop() const { return loop_; }
+
  private:
   void DeleteFromScheduledTasks(DelayedTask* task);