diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorForwardDeclarations.h b/unsupported/Eigen/CXX11/src/Tensor/TensorForwardDeclarations.h
index ff8a19f87..a95f22631 100644
--- a/unsupported/Eigen/CXX11/src/Tensor/TensorForwardDeclarations.h
+++ b/unsupported/Eigen/CXX11/src/Tensor/TensorForwardDeclarations.h
@@ -23,7 +23,7 @@ template<typename T> struct MakePointer {
 };
 
 template <typename T>
-EIGEN_STRONG_INLINE T* constCast(const T* data) {
+EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE T* constCast(const T* data) {
   return const_cast<T*>(data);
 }