diff --git a/vcg/math/eigen.h b/vcg/math/eigen.h
index 56e73e12..62074f72 100644
--- a/vcg/math/eigen.h
+++ b/vcg/math/eigen.h
@@ -32,6 +32,7 @@
 // forward declarations
 namespace Eigen {
 
+template<typename T> struct ei_traits;
 #include "../Eigen/src/Core/util/Meta.h"
 
 template<typename Derived1, typename Derived2, int Size> struct ei_lexi_comparison;
diff --git a/vcg/math/eigen_matrixbase_addons.h b/vcg/math/eigen_matrixbase_addons.h
index 30c7b20c..90914d90 100644
--- a/vcg/math/eigen_matrixbase_addons.h
+++ b/vcg/math/eigen_matrixbase_addons.h
@@ -199,8 +199,6 @@ EIGEN_DEPRECATED inline Derived& Normalize() { normalize(); return derived(); };
 /** \deprecated use normalized() */
 EIGEN_DEPRECATED inline const EvalType Normalize() const { return normalized(); };
 
-inline void transposeInPlace() { derived() = derived().transpose().eval(); }
-
 /** \deprecated use .cross(p) */
 EIGEN_DEPRECATED inline EvalType operator ^ (const Derived& p ) const { return this->cross(p); }
 
diff --git a/vcg/math/matrix44.h b/vcg/math/matrix44.h
index f202b4e4..e571fafb 100644
--- a/vcg/math/matrix44.h
+++ b/vcg/math/matrix44.h
@@ -104,7 +104,6 @@ public:
 	using _Base::coeffRef;
 	using _Base::ElementAt;
 	using _Base::setZero;
-	using _Base::operator*;
 
 	_EIGEN_GENERIC_PUBLIC_INTERFACE(Matrix44,_Base);
 	typedef _Scalar ScalarType;
@@ -158,7 +157,7 @@ public:
   // note: this function is defined here because some compilers cannot find the respective declaration
   template<typename OtherDerived>
   inline const typename ei_matrix44_product_impl<OtherDerived>::ResultType
-  operator * (const MatrixBase<OtherDerived> &other) const
+  operator * (const Eigen::MatrixBase<OtherDerived> &other) const
   { return ei_matrix44_product_impl<OtherDerived>::run(*this,other.derived()); }
 
   /** Contatenates two transformations */