diff --git a/src/thread.cc b/src/thread.cc
index 3ed388b..02956ed 100644
--- a/src/thread.cc
+++ b/src/thread.cc
@@ -170,7 +170,7 @@
 
 Thread* Thread::FromManagedThread(const ScopedObjectAccessUnchecked& soa,
                                   mirror::Object* thread_peer) {
-  mirror::Field* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_vmData);
+  mirror::Field* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer);
   Thread* result = reinterpret_cast<Thread*>(static_cast<uintptr_t>(f->GetInt(thread_peer)));
   // Sanity check that if we have a result it is either suspended or we hold the thread_list_lock_
   // to stop it from going away.
@@ -276,9 +276,9 @@
   child_thread->jpeer_ = env->NewGlobalRef(java_peer);
   stack_size = FixStackSize(stack_size);
 
-  // Thread.start is synchronized, so we know that vmData is 0, and know that we're not racing to
+  // Thread.start is synchronized, so we know that nativePeer is 0, and know that we're not racing to
   // assign it.
-  env->SetIntField(java_peer, WellKnownClasses::java_lang_Thread_vmData,
+  env->SetIntField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer,
                    reinterpret_cast<jint>(child_thread));
 
   pthread_t new_pthread;
@@ -301,7 +301,7 @@
     delete child_thread;
     child_thread = NULL;
     // TODO: remove from thread group?
-    env->SetIntField(java_peer, WellKnownClasses::java_lang_Thread_vmData, 0);
+    env->SetIntField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 0);
     {
       std::string msg(StringPrintf("pthread_create (%s stack) failed: %s",
                                    PrettySize(stack_size).c_str(), strerror(pthread_create_result)));
@@ -406,7 +406,7 @@
 
   Thread* self = this;
   DCHECK_EQ(self, Thread::Current());
-  jni_env_->SetIntField(peer.get(), WellKnownClasses::java_lang_Thread_vmData,
+  jni_env_->SetIntField(peer.get(), WellKnownClasses::java_lang_Thread_nativePeer,
                         reinterpret_cast<jint>(self));
 
   ScopedObjectAccess soa(self);
@@ -1027,8 +1027,8 @@
     HandleUncaughtExceptions(soa);
     RemoveFromThreadGroup(soa);
 
-    // this.vmData = 0;
-    soa.DecodeField(WellKnownClasses::java_lang_Thread_vmData)->SetInt(opeer_, 0);
+    // this.nativePeer = 0;
+    soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer)->SetInt(opeer_, 0);
     Dbg::PostThreadDeath(self);
 
     // Thread.join() is implemented as an Object.wait() on the Thread.lock object. Signal anyone
diff --git a/src/well_known_classes.cc b/src/well_known_classes.cc
index f836f4f..4d34c73 100644
--- a/src/well_known_classes.cc
+++ b/src/well_known_classes.cc
@@ -77,7 +77,7 @@
 jfieldID WellKnownClasses::java_lang_Thread_name;
 jfieldID WellKnownClasses::java_lang_Thread_priority;
 jfieldID WellKnownClasses::java_lang_Thread_uncaughtHandler;
-jfieldID WellKnownClasses::java_lang_Thread_vmData;
+jfieldID WellKnownClasses::java_lang_Thread_nativePeer;
 jfieldID WellKnownClasses::java_lang_ThreadGroup_mainThreadGroup;
 jfieldID WellKnownClasses::java_lang_ThreadGroup_name;
 jfieldID WellKnownClasses::java_lang_ThreadGroup_systemThreadGroup;
@@ -172,7 +172,7 @@
   java_lang_Thread_name = CacheField(env, java_lang_Thread, false, "name", "Ljava/lang/String;");
   java_lang_Thread_priority = CacheField(env, java_lang_Thread, false, "priority", "I");
   java_lang_Thread_uncaughtHandler = CacheField(env, java_lang_Thread, false, "uncaughtHandler", "Ljava/lang/Thread$UncaughtExceptionHandler;");
-  java_lang_Thread_vmData = CacheField(env, java_lang_Thread, false, "vmData", "I");
+  java_lang_Thread_nativePeer = CacheField(env, java_lang_Thread, false, "nativePeer", "I");
   java_lang_ThreadGroup_mainThreadGroup = CacheField(env, java_lang_ThreadGroup, true, "mainThreadGroup", "Ljava/lang/ThreadGroup;");
   java_lang_ThreadGroup_name = CacheField(env, java_lang_ThreadGroup, false, "name", "Ljava/lang/String;");
   java_lang_ThreadGroup_systemThreadGroup = CacheField(env, java_lang_ThreadGroup, true, "systemThreadGroup", "Ljava/lang/ThreadGroup;");
diff --git a/src/well_known_classes.h b/src/well_known_classes.h
index d9acf2d..8170520 100644
--- a/src/well_known_classes.h
+++ b/src/well_known_classes.h
@@ -90,7 +90,7 @@
   static jfieldID java_lang_Thread_name;
   static jfieldID java_lang_Thread_priority;
   static jfieldID java_lang_Thread_uncaughtHandler;
-  static jfieldID java_lang_Thread_vmData;
+  static jfieldID java_lang_Thread_nativePeer;
   static jfieldID java_lang_ThreadGroup_mainThreadGroup;
   static jfieldID java_lang_ThreadGroup_name;
   static jfieldID java_lang_ThreadGroup_systemThreadGroup;