typename MetricType::Pointer metric=genericMetric->GetMetricPointer();
if (movingMask) metric->SetMovingImageMask(movingMask);
-#ifdef ITK_USE_OPTIMIZED_REGISTRATION_METHODS
+#if defined(ITK_USE_OPTIMIZED_REGISTRATION_METHODS) || ITK_VERSION_MAJOR >= 4
if (threadsGiven) {
metric->SetNumberOfThreads( threads );
if (m_Verbose) std::cout<< "Using " << threads << " threads." << std::endl;