diff --git a/unsupported/Eigen/AlignedVector3 b/unsupported/Eigen/AlignedVector3
index 1fce00525..93b017437 100644
--- a/unsupported/Eigen/AlignedVector3
+++ b/unsupported/Eigen/AlignedVector3
@@ -193,6 +193,12 @@ template<typename _Scalar> class AlignedVector3
 
 namespace internal {
 
+template<typename _Scalar>
+struct eval<AlignedVector3<_Scalar>, Dense>
+{
+ typedef const AlignedVector3<_Scalar>& type;
+};
+
 template<typename Scalar>
 struct evaluator<AlignedVector3<Scalar> >
   : evaluator<Matrix<Scalar,4,1> >::type
diff --git a/unsupported/test/alignedvector3.cpp b/unsupported/test/alignedvector3.cpp
index 0e6226ad3..911996413 100644
--- a/unsupported/test/alignedvector3.cpp
+++ b/unsupported/test/alignedvector3.cpp
@@ -59,6 +59,11 @@ void alignedvector3()
   f2.normalize();
   r2.normalize();
   VERIFY_IS_APPROX(f2,r2);
+  
+  std::stringstream ss1, ss2;
+  ss1 << f1;
+  ss2 << r1;
+  VERIFY(ss1.str()==ss2.str());
 }
 
 void test_alignedvector3()