diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorTrace.h b/unsupported/Eigen/CXX11/src/Tensor/TensorTrace.h
index c1499852cd634fe4ad75e9feb553516f75cce53e..5357a482d077c0d688d2d18ecc60c39b6f559e42 100644
--- a/unsupported/Eigen/CXX11/src/Tensor/TensorTrace.h
+++ b/unsupported/Eigen/CXX11/src/Tensor/TensorTrace.h
@@ -27,6 +27,10 @@ struct traits<TensorTraceOp<Dims, XprType> > : public traits<XprType> {
   typedef std::remove_reference_t<Nested> Nested_;
   static constexpr int NumDimensions = XprTraits::NumDimensions - array_size<Dims>::value;
   static constexpr int Layout = XprTraits::Layout;
+  enum {
+    // Trace is read-only.
+    Flags = traits<XprType>::Flags & ~LvalueBit
+  };
 };
 
 template <typename Dims, typename XprType>
@@ -203,6 +207,8 @@ struct TensorEvaluator<const TensorTraceOp<Dims, ArgType>, Device> {
     return true;
   }
 
+  EIGEN_DEVICE_FUNC EvaluatorPointerType data() const { return nullptr; }
+
   EIGEN_STRONG_INLINE void cleanup() { m_impl.cleanup(); }
 
   EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE CoeffReturnType coeff(Index index) const {
diff --git a/unsupported/test/cxx11_tensor_ref.cpp b/unsupported/test/cxx11_tensor_ref.cpp
index cf097499da655276c99a6e171de3163a58d77f7c..5e796b47b47f2e3208d94730f398a60bc82ae87a 100644
--- a/unsupported/test/cxx11_tensor_ref.cpp
+++ b/unsupported/test/cxx11_tensor_ref.cpp
@@ -41,6 +41,9 @@ static void test_simple_lvalue_ref() {
   for (int i = 0; i < 6; ++i) {
     VERIFY_IS_EQUAL(input(i), -i * 2);
   }
+
+  TensorRef<const Tensor<int, 1>> ref5(input.trace());
+  VERIFY_IS_EQUAL(ref5[0], input[0]);
 }
 
 static void test_simple_rvalue_ref() {