--- a/gfx/thebes/gfxWindowsPlatform.cpp
+++ b/gfx/thebes/gfxWindowsPlatform.cpp
@@ -1968,23 +1968,16 @@ public:
         : mVsyncEnabledLock("D3DVsyncEnabledLock")
         , mVsyncEnabled(false)
       {
         mVsyncThread = new base::Thread("WindowsVsyncThread");
         const double rate = 1000 / 60.0;
         mSoftwareVsyncRate = TimeDuration::FromMilliseconds(rate);
       }
 
-      virtual ~D3DVsyncDisplay()
-      {
-        MOZ_ASSERT(NS_IsMainThread());
-        DisableVsync();
-        delete mVsyncThread;
-      }
-
       virtual void EnableVsync() MOZ_OVERRIDE
       {
         MOZ_ASSERT(NS_IsMainThread());
         { // scope lock
           MonitorAutoLock lock(mVsyncEnabledLock);
           if (mVsyncEnabled) {
             return;
           }
@@ -2077,16 +2070,23 @@ public:
             MOZ_ASSERT(adjust > 0);
             uint64_t usAdjust = (adjust * microseconds) / frequency.QuadPart;
             vsync -= TimeDuration::FromMicroseconds((double) usAdjust);
           }
         } // end for
       }
 
     private:
+      virtual ~D3DVsyncDisplay()
+      {
+        MOZ_ASSERT(NS_IsMainThread());
+        DisableVsync();
+        delete mVsyncThread;
+      }
+
       bool IsInVsyncThread()
       {
         return mVsyncThread->thread_id() == PlatformThread::CurrentId();
       }
 
       TimeDuration mSoftwareVsyncRate;
       Monitor mVsyncEnabledLock;
       base::Thread* mVsyncThread;