diff --git a/src/node_platform.cc b/src/node_platform.cc
index 6fc83950d3083e..f2407f5be2d3c8 100644
--- a/src/node_platform.cc
+++ b/src/node_platform.cc
@@ -65,7 +65,7 @@ size_t BackgroundTaskRunner::NumberOfAvailableBackgroundThreads() const {
 
 PerIsolatePlatformData::PerIsolatePlatformData(
     v8::Isolate* isolate, uv_loop_t* loop)
-  : isolate_(isolate), loop_(loop) {
+  : loop_(loop) {
   flush_tasks_ = new uv_async_t();
   CHECK_EQ(0, uv_async_init(loop, flush_tasks_, FlushTasks));
   flush_tasks_->data = static_cast<void*>(this);
diff --git a/src/node_platform.h b/src/node_platform.h
index 8f6ff89f491fe3..cf0809ad1f673b 100644
--- a/src/node_platform.h
+++ b/src/node_platform.h
@@ -80,7 +80,6 @@ class PerIsolatePlatformData :
   static void RunForegroundTask(uv_timer_t* timer);
 
   int ref_count_ = 1;
-  v8::Isolate* isolate_;
   uv_loop_t* const loop_;
   uv_async_t* flush_tasks_ = nullptr;
   TaskQueue<v8::Task> foreground_tasks_;