diff --git a/test/packetmath.cpp b/test/packetmath.cpp
index 327f2eeea..6fec9259d 100644
--- a/test/packetmath.cpp
+++ b/test/packetmath.cpp
@@ -61,10 +61,10 @@ template<typename Scalar> void packetmath()
   const int PacketSize = ei_packet_traits<Scalar>::size;
 
   const int size = PacketSize*4;
-  Scalar data1[ei_packet_traits<Scalar>::size*4];
-  Scalar data2[ei_packet_traits<Scalar>::size*4];
-  Packet packets[PacketSize*2];
-  Scalar ref[ei_packet_traits<Scalar>::size*4];
+  EIGEN_ALIGN_128 Scalar data1[ei_packet_traits<Scalar>::size*4];
+  EIGEN_ALIGN_128 Scalar data2[ei_packet_traits<Scalar>::size*4];
+  EIGEN_ALIGN_128 Packet packets[PacketSize*2];
+  EIGEN_ALIGN_128 Scalar ref[ei_packet_traits<Scalar>::size*4];
   for (int i=0; i<size; ++i)
   {
     data1[i] = ei_random<Scalar>();