diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorCostModel.h b/unsupported/Eigen/CXX11/src/Tensor/TensorCostModel.h
index 4cb37a6..cb6fb46 100644
--- a/unsupported/Eigen/CXX11/src/Tensor/TensorCostModel.h
+++ b/unsupported/Eigen/CXX11/src/Tensor/TensorCostModel.h
@@ -10,9 +10,8 @@
 #ifndef EIGEN_CXX11_TENSOR_TENSOR_COST_MODEL_H
 #define EIGEN_CXX11_TENSOR_TENSOR_COST_MODEL_H
 
-//#if !defined(EIGEN_USE_GPU)
-//#define EIGEN_USE_COST_MODEL
-//#endif
+// Turn on the cost model by default
+#define EIGEN_USE_COST_MODEL
 
 namespace Eigen {