diff --git a/Eigen/src/Core/Assign.h b/Eigen/src/Core/Assign.h
index 2a7ca4786..a2ca35d3e 100644
--- a/Eigen/src/Core/Assign.h
+++ b/Eigen/src/Core/Assign.h
@@ -397,7 +397,12 @@ struct ei_assign_impl<Derived1, Derived2, LinearVectorizedTraversal, NoUnrolling
   EIGEN_STRONG_INLINE static void run(Derived1 &dst, const Derived2 &src)
   {
     const Index size = dst.size();
-    const Index packetSize = ei_packet_traits<typename Derived1::Scalar>::size;
+    typedef ei_packet_traits<typename Derived1::Scalar> PacketTraits;
+    enum {
+      packetSize = PacketTraits::size,
+      dstAlignment = PacketTraits::AlignedOnScalar ? Aligned : int(ei_assign_traits<Derived1,Derived2>::DstIsAligned) ,
+      srcAlignment = ei_assign_traits<Derived1,Derived2>::JointAlignment
+    };
     const Index alignedStart = ei_assign_traits<Derived1,Derived2>::DstIsAligned ? 0
                              : ei_first_aligned(&dst.coeffRef(0), size);
     const Index alignedEnd = alignedStart + ((size-alignedStart)/packetSize)*packetSize;
@@ -406,7 +411,7 @@ struct ei_assign_impl<Derived1, Derived2, LinearVectorizedTraversal, NoUnrolling
 
     for(Index index = alignedStart; index < alignedEnd; index += packetSize)
     {
-      dst.template copyPacket<Derived2, Aligned, ei_assign_traits<Derived1,Derived2>::JointAlignment>(index, src);
+      dst.template copyPacket<Derived2, dstAlignment, srcAlignment>(index, src);
     }
 
     ei_unaligned_assign_impl<>::run(src,dst,alignedEnd,size);
diff --git a/Eigen/src/Core/GenericPacketMath.h b/Eigen/src/Core/GenericPacketMath.h
index 77b1d748e..d290074e5 100644
--- a/Eigen/src/Core/GenericPacketMath.h
+++ b/Eigen/src/Core/GenericPacketMath.h
@@ -84,7 +84,8 @@ template<typename T> struct ei_packet_traits : ei_default_packet_traits
   typedef T type;
   enum {
     Vectorizable = 0,
-    size = 1
+    size = 1,
+    AlignedOnScalar = 0
   };
   enum {
     HasAdd    = 0,
diff --git a/Eigen/src/Core/arch/AltiVec/PacketMath.h b/Eigen/src/Core/arch/AltiVec/PacketMath.h
index 9e6a375ea..f58da60e6 100644
--- a/Eigen/src/Core/arch/AltiVec/PacketMath.h
+++ b/Eigen/src/Core/arch/AltiVec/PacketMath.h
@@ -88,6 +88,7 @@ template<> struct ei_packet_traits<float>  : ei_default_packet_traits
   typedef Packet4f type;
   enum {
     Vectorizable = 1,
+    AlignedOnScalar = 1,
     size=4,
 
     // FIXME check the Has*
@@ -104,6 +105,7 @@ template<> struct ei_packet_traits<int>    : ei_default_packet_traits
   enum {
     // FIXME check the Has*
     Vectorizable = 1,
+    AlignedOnScalar = 1,
     size=4
   };
 };
diff --git a/Eigen/src/Core/arch/NEON/PacketMath.h b/Eigen/src/Core/arch/NEON/PacketMath.h
index aaa27b56d..97750adbe 100644
--- a/Eigen/src/Core/arch/NEON/PacketMath.h
+++ b/Eigen/src/Core/arch/NEON/PacketMath.h
@@ -62,6 +62,7 @@ template<> struct ei_packet_traits<float>  : ei_default_packet_traits
   typedef Packet4f type;
   enum {
     Vectorizable = 1,
+    AlignedOnScalar = 1,
     size = 4,
 
     // FIXME check the Has*
@@ -77,6 +78,7 @@ template<> struct ei_packet_traits<int>    : ei_default_packet_traits
   typedef Packet4i type;
   enum {
     Vectorizable = 1,
+    AlignedOnScalar = 1,
     size=4
     // FIXME check the Has*
   };
diff --git a/Eigen/src/Core/arch/SSE/Complex.h b/Eigen/src/Core/arch/SSE/Complex.h
index b288c4cdc..6b73a42f9 100644
--- a/Eigen/src/Core/arch/SSE/Complex.h
+++ b/Eigen/src/Core/arch/SSE/Complex.h
@@ -38,6 +38,7 @@ template<> struct ei_packet_traits<std::complex<float> >  : ei_default_packet_tr
   typedef Packet2cf type;
   enum {
     Vectorizable = 1,
+    AlignedOnScalar = 1,
     size = 2,
 
     HasAdd    = 1,
@@ -224,6 +225,7 @@ template<> struct ei_packet_traits<std::complex<double> >  : ei_default_packet_t
   typedef Packet1cd type;
   enum {
     Vectorizable = 1,
+    AlignedOnScalar = 0,
     size = 1,
 
     HasAdd    = 1,
diff --git a/Eigen/src/Core/arch/SSE/PacketMath.h b/Eigen/src/Core/arch/SSE/PacketMath.h
index 9382fbde5..bfbc74370 100644
--- a/Eigen/src/Core/arch/SSE/PacketMath.h
+++ b/Eigen/src/Core/arch/SSE/PacketMath.h
@@ -67,6 +67,7 @@ template<> struct ei_packet_traits<float>  : ei_default_packet_traits
   typedef Packet4f type;
   enum {
     Vectorizable = 1,
+    AlignedOnScalar = 1,
     size=4,
 
     HasDiv    = 1,
@@ -82,6 +83,7 @@ template<> struct ei_packet_traits<double> : ei_default_packet_traits
   typedef Packet2d type;
   enum {
     Vectorizable = 1,
+    AlignedOnScalar = 1,
     size=2,
 
     HasDiv    = 1
@@ -93,6 +95,7 @@ template<> struct ei_packet_traits<int>    : ei_default_packet_traits
   enum {
     // FIXME check the Has*
     Vectorizable = 1,
+    AlignedOnScalar = 1,
     size=4
   };
 };