diff --git a/include/eigenpy/details.hpp b/include/eigenpy/details.hpp
index ed7a3cb5cf50335d621429bfc7b386f980839711..693a4b723ce201a6c2fb3a93ce19d7aa87b0ee0b 100644
--- a/include/eigenpy/details.hpp
+++ b/include/eigenpy/details.hpp
@@ -104,6 +104,8 @@ namespace eigenpy
       NumpyMatrixType = reinterpret_cast<PyTypeObject*>(NumpyMatrixObject.ptr());
       NumpyArrayObject = pyModule.attr("ndarray");
       NumpyArrayType = reinterpret_cast<PyTypeObject*>(NumpyArrayObject.ptr());
+      NumpyAsMatrixObject = pyModule.attr("asmatrix");
+      NumpyAsMatrixType = reinterpret_cast<PyTypeObject*>(NumpyAsMatrixObject.ptr());
       
       CurrentNumpyType = NumpyMatrixObject; // default conversion
     }
@@ -113,6 +115,7 @@ namespace eigenpy
     
     // Numpy types
     bp::object NumpyMatrixObject; PyTypeObject * NumpyMatrixType;
+    bp::object NumpyAsMatrixObject; PyTypeObject * NumpyAsMatrixType;
     bp::object NumpyArrayObject; PyTypeObject * NumpyArrayType;
   };