diff --git a/Eigen/src/Core/Dot.h b/Eigen/src/Core/Dot.h
index 16496273c..0d8856efa 100644
--- a/Eigen/src/Core/Dot.h
+++ b/Eigen/src/Core/Dot.h
@@ -41,18 +41,20 @@ template<typename T, typename U,
 >
 struct dot_nocheck
 {
-  static inline typename traits<T>::Scalar run(const MatrixBase<T>& a, const MatrixBase<U>& b)
+  typedef typename scalar_product_traits<typename traits<T>::Scalar,typename traits<U>::Scalar>::ReturnType ResScalar;
+  static inline ResScalar run(const MatrixBase<T>& a, const MatrixBase<U>& b)
   {
-    return a.template binaryExpr<scalar_conj_product_op<typename traits<T>::Scalar> >(b).sum();
+    return a.template binaryExpr<scalar_conj_product_op<typename traits<T>::Scalar,typename traits<U>::Scalar> >(b).sum();
   }
 };
 
 template<typename T, typename U>
 struct dot_nocheck<T, U, true>
 {
-  static inline typename traits<T>::Scalar run(const MatrixBase<T>& a, const MatrixBase<U>& b)
+  typedef typename scalar_product_traits<typename traits<T>::Scalar,typename traits<U>::Scalar>::ReturnType ResScalar;
+  static inline ResScalar run(const MatrixBase<T>& a, const MatrixBase<U>& b)
   {
-    return a.transpose().template binaryExpr<scalar_conj_product_op<typename traits<T>::Scalar> >(b).sum();
+    return a.transpose().template binaryExpr<scalar_conj_product_op<typename traits<T>::Scalar,typename traits<U>::Scalar> >(b).sum();
   }
 };
 
@@ -70,14 +72,14 @@ struct dot_nocheck<T, U, true>
   */
 template<typename Derived>
 template<typename OtherDerived>
-typename internal::traits<Derived>::Scalar
+typename internal::scalar_product_traits<typename internal::traits<Derived>::Scalar,typename internal::traits<OtherDerived>::Scalar>::ReturnType
 MatrixBase<Derived>::dot(const MatrixBase<OtherDerived>& other) const
 {
   EIGEN_STATIC_ASSERT_VECTOR_ONLY(Derived)
   EIGEN_STATIC_ASSERT_VECTOR_ONLY(OtherDerived)
   EIGEN_STATIC_ASSERT_SAME_VECTOR_SIZE(Derived,OtherDerived)
-  EIGEN_STATIC_ASSERT((internal::is_same<Scalar, typename OtherDerived::Scalar>::value),
-    YOU_MIXED_DIFFERENT_NUMERIC_TYPES__YOU_NEED_TO_USE_THE_CAST_METHOD_OF_MATRIXBASE_TO_CAST_NUMERIC_TYPES_EXPLICITLY)
+  typedef internal::scalar_conj_product_op<Scalar,typename OtherDerived::Scalar> func;
+  EIGEN_CHECK_BINARY_COMPATIBILIY(func,Scalar,typename OtherDerived::Scalar);
 
   eigen_assert(size() == other.size());
 
diff --git a/Eigen/src/Core/Functors.h b/Eigen/src/Core/Functors.h
index 325a7dd85..917769c9e 100644
--- a/Eigen/src/Core/Functors.h
+++ b/Eigen/src/Core/Functors.h
@@ -59,6 +59,7 @@ struct functor_traits<scalar_sum_op<Scalar> > {
   */
 template<typename LhsScalar,typename RhsScalar> struct scalar_product_op {
   enum {
+    // TODO vectorize mixed product
     Vectorizable = is_same<LhsScalar,RhsScalar>::value && packet_traits<LhsScalar>::HasMul && packet_traits<RhsScalar>::HasMul
   };
   typedef typename scalar_product_traits<LhsScalar,RhsScalar>::ReturnType result_type;
@@ -84,24 +85,27 @@ struct functor_traits<scalar_product_op<LhsScalar,RhsScalar> > {
   *
   * This is a short cut for conj(x) * y which is needed for optimization purpose; in Eigen2 support mode, this becomes x * conj(y)
   */
-template<typename Scalar> struct scalar_conj_product_op {
+template<typename LhsScalar,typename RhsScalar> struct scalar_conj_product_op {
 
   enum {
-    Conj = NumTraits<Scalar>::IsComplex
+    Conj = NumTraits<LhsScalar>::IsComplex
   };
   
+  typedef typename scalar_product_traits<LhsScalar,RhsScalar>::ReturnType result_type;
+  
   EIGEN_EMPTY_STRUCT_CTOR(scalar_conj_product_op)
-  EIGEN_STRONG_INLINE const Scalar operator() (const Scalar& a, const Scalar& b) const
-  { return conj_helper<Scalar,Scalar,Conj,false>().pmul(a,b); }
+  EIGEN_STRONG_INLINE const result_type operator() (const LhsScalar& a, const RhsScalar& b) const
+  { return conj_helper<LhsScalar,RhsScalar,Conj,false>().pmul(a,b); }
+  
   template<typename Packet>
   EIGEN_STRONG_INLINE const Packet packetOp(const Packet& a, const Packet& b) const
   { return conj_helper<Packet,Packet,Conj,false>().pmul(a,b); }
 };
-template<typename Scalar>
-struct functor_traits<scalar_conj_product_op<Scalar> > {
+template<typename LhsScalar,typename RhsScalar>
+struct functor_traits<scalar_conj_product_op<LhsScalar,RhsScalar> > {
   enum {
-    Cost = NumTraits<Scalar>::MulCost,
-    PacketAccess = packet_traits<Scalar>::HasMul
+    Cost = NumTraits<LhsScalar>::MulCost,
+    PacketAccess = internal::is_same<LhsScalar, RhsScalar>::value && packet_traits<LhsScalar>::HasMul
   };
 };
 
@@ -622,6 +626,7 @@ template<typename Scalar> struct functor_has_linear_access<scalar_identity_op<Sc
 // FIXME move this to functor_traits adding a functor_default
 template<typename Functor> struct functor_allows_mixing_real_and_complex { enum { ret = 0 }; };
 template<typename LhsScalar,typename RhsScalar> struct functor_allows_mixing_real_and_complex<scalar_product_op<LhsScalar,RhsScalar> > { enum { ret = 1 }; };
+template<typename LhsScalar,typename RhsScalar> struct functor_allows_mixing_real_and_complex<scalar_conj_product_op<LhsScalar,RhsScalar> > { enum { ret = 1 }; };
 
 
 /** \internal
diff --git a/Eigen/src/Core/MatrixBase.h b/Eigen/src/Core/MatrixBase.h
index 3b854ca5e..f318bfd5d 100644
--- a/Eigen/src/Core/MatrixBase.h
+++ b/Eigen/src/Core/MatrixBase.h
@@ -202,10 +202,11 @@ template<typename Derived> class MatrixBase
 
     #if EIGEN2_SUPPORT_STAGE != STAGE20_RESOLVE_API_CONFLICTS
       template<typename OtherDerived>
+      typename internal::scalar_product_traits<typename internal::traits<Derived>::Scalar,typename internal::traits<OtherDerived>::Scalar>::ReturnType
       #if EIGEN2_SUPPORT_STAGE == STAGE15_RESOLVE_API_CONFLICTS_WARN
-      EIGEN_DEPRECATED
+      EIGEN_DEPRECATED Scalar
       #endif
-      Scalar dot(const MatrixBase<OtherDerived>& other) const;
+      dot(const MatrixBase<OtherDerived>& other) const;
     #endif
     
     #ifdef EIGEN2_SUPPORT
diff --git a/Eigen/src/Core/util/ForwardDeclarations.h b/Eigen/src/Core/util/ForwardDeclarations.h
index 5a2de7095..a516a7094 100644
--- a/Eigen/src/Core/util/ForwardDeclarations.h
+++ b/Eigen/src/Core/util/ForwardDeclarations.h
@@ -155,7 +155,7 @@ template<typename LhsScalar, typename RhsScalar, bool ConjLhs=false, bool ConjRh
 
 template<typename Scalar> struct scalar_sum_op;
 template<typename Scalar> struct scalar_difference_op;
-template<typename Scalar> struct scalar_conj_product_op;
+template<typename LhsScalar,typename RhsScalar> struct scalar_conj_product_op;
 template<typename Scalar> struct scalar_quotient_op;
 template<typename Scalar> struct scalar_opposite_op;
 template<typename Scalar> struct scalar_conjugate_op;
diff --git a/test/adjoint.cpp b/test/adjoint.cpp
index 72cbf3406..47889591f 100644
--- a/test/adjoint.cpp
+++ b/test/adjoint.cpp
@@ -106,6 +106,11 @@ template<typename MatrixType> void adjoint(const MatrixType& m)
   m3.transposeInPlace();
   VERIFY_IS_APPROX(m3,m1.conjugate());
 
+  // check mixed dot product
+  typedef Matrix<RealScalar, MatrixType::RowsAtCompileTime, 1> RealVectorType;
+  RealVectorType rv1 = RealVectorType::Random(rows);
+  VERIFY_IS_APPROX(v1.dot(rv1.template cast<Scalar>()), v1.dot(rv1));
+  VERIFY_IS_APPROX(rv1.template cast<Scalar>().dot(v1), rv1.dot(v1));
 }
 
 void test_adjoint()