diff --git a/src/libslic3r/SLA/SLABoilerPlate.hpp b/src/libslic3r/SLA/SLABoilerPlate.hpp
index e94eaf2c21..9a79c8e58f 100644
--- a/src/libslic3r/SLA/SLABoilerPlate.hpp
+++ b/src/libslic3r/SLA/SLABoilerPlate.hpp
@@ -64,7 +64,7 @@ struct Contour3D {
     }
 };
 
-using PointSet = Eigen::MatrixXd;
+//using PointSet = Eigen::Matrix<double, Eigen::Dynamic, Eigen::Dynamic, Eigen::DontAlign>; //Eigen::MatrixXd;
 using ClusterEl = std::vector<unsigned>;
 using ClusteredPoints = std::vector<ClusterEl>;
 
diff --git a/src/libslic3r/SLA/SLASupportTree.cpp b/src/libslic3r/SLA/SLASupportTree.cpp
index 9ebaa98e0a..7adaea1f4c 100644
--- a/src/libslic3r/SLA/SLASupportTree.cpp
+++ b/src/libslic3r/SLA/SLASupportTree.cpp
@@ -1618,7 +1618,7 @@ SlicedSupports SLASupportTree::slice(float layerh, float init_layerh) const
         heights.emplace_back(h);
     }
 
-    std::vector<SlicedSupports> mergev(heights.size(), {});
+    std::vector<SlicedSupports> mergev(heights.size());
 
     slice_part(stree.heads(), mergev, heights);
     slice_part(stree.pillars(), mergev, heights);
diff --git a/src/libslic3r/SLA/SLASupportTree.hpp b/src/libslic3r/SLA/SLASupportTree.hpp
index 0ebbacdadb..f9691b19f5 100644
--- a/src/libslic3r/SLA/SLASupportTree.hpp
+++ b/src/libslic3r/SLA/SLASupportTree.hpp
@@ -74,11 +74,13 @@ struct Controller {
 /// An index-triangle structure for libIGL functions. Also serves as an
 /// alternative (raw) input format for the SLASupportTree
 struct EigenMesh3D {
-    Eigen::MatrixXd V;
-    Eigen::MatrixXi F;
+//    Eigen::MatrixXd V;
+//    Eigen::MatrixXi F;
+    Eigen::Matrix<double, Eigen::Dynamic, Eigen::Dynamic, Eigen::DontAlign> V;
+    Eigen::Matrix<int, Eigen::Dynamic, Eigen::Dynamic, Eigen::DontAlign> F;
 };
 
-using PointSet = Eigen::MatrixXd;
+using PointSet = Eigen::Matrix<double, Eigen::Dynamic, Eigen::Dynamic, Eigen::DontAlign>; //Eigen::MatrixXd;
 
 /* ************************************************************************** */
 /* TODO: May not be needed:                                                   */
diff --git a/src/libslic3r/SLA/SLASupportTreeIGL.cpp b/src/libslic3r/SLA/SLASupportTreeIGL.cpp
index 88782ba061..7509827ea4 100644
--- a/src/libslic3r/SLA/SLASupportTreeIGL.cpp
+++ b/src/libslic3r/SLA/SLASupportTreeIGL.cpp
@@ -76,8 +76,10 @@ size_t SpatIndex::size() const
 }
 
 PointSet normals(const PointSet& points, const EigenMesh3D& mesh) {
-    Eigen::VectorXd dists;
-    Eigen::VectorXi I;
+//    Eigen::VectorXd dists;
+//    Eigen::VectorXi I;
+    Eigen::Matrix<double, Eigen::Dynamic, 1, Eigen::DontAlign> dists;
+    Eigen::Matrix<int, Eigen::Dynamic, 1, Eigen::DontAlign> I;
     PointSet C;
     igl::point_mesh_squared_distance( points, mesh.V, mesh.F, dists, I, C);