diff --git a/test/product_trsolve.cpp b/test/product_trsolve.cpp
index ec9cc9c73..f9ad049a4 100644
--- a/test/product_trsolve.cpp
+++ b/test/product_trsolve.cpp
@@ -45,8 +45,9 @@ template<typename Scalar,int Size, int Cols> void trsolve(int size=Size,int cols
 
   enum {  colmajor = Size==1 ? RowMajor : ColMajor,
           rowmajor = Cols==1 ? ColMajor : RowMajor };
-  Matrix<Scalar,Size,Cols,colmajor> cmRhs(size,cols), ref(size,cols);
+  Matrix<Scalar,Size,Cols,colmajor> cmRhs(size,cols);
   Matrix<Scalar,Size,Cols,rowmajor> rmRhs(size,cols);
+  Matrix<Scalar,Dynamic,Dynamic,colmajor> ref(size,cols);
 
   cmLhs.setRandom(); cmLhs *= static_cast<RealScalar>(0.1); cmLhs.diagonal().array() += static_cast<RealScalar>(1);
   rmLhs.setRandom(); rmLhs *= static_cast<RealScalar>(0.1); rmLhs.diagonal().array() += static_cast<RealScalar>(1);