diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorForwardDeclarations.h b/unsupported/Eigen/CXX11/src/Tensor/TensorForwardDeclarations.h
index 8ed1796df..ec1dc0fab 100644
--- a/unsupported/Eigen/CXX11/src/Tensor/TensorForwardDeclarations.h
+++ b/unsupported/Eigen/CXX11/src/Tensor/TensorForwardDeclarations.h
@@ -21,6 +21,7 @@ namespace Eigen {
 template<typename T> struct MakePointer {
   typedef T* Type;
   typedef T& RefType;
+  typedef T ScalarType;
 };
 
 namespace internal{