diff --git a/src/libslic3r/Print.hpp b/src/libslic3r/Print.hpp
index 29c98969146..dc4d0124f34 100644
--- a/src/libslic3r/Print.hpp
+++ b/src/libslic3r/Print.hpp
@@ -651,14 +651,14 @@ struct FakeWipeTower
         std::vector<ExtrusionPaths> paths;
         for (float h = 0.f; h < height; h += layer_height) {
             ExtrusionPath path(ExtrusionRole::erWipeTower, 0.0, 0.0, layer_height);
-            path.polyline = Polyline{{minCorner, {maxCorner.x(), minCorner.y()}, maxCorner, {minCorner.x(), maxCorner.y()}, minCorner}};
+            path.polyline = Polyline3(Polyline{{minCorner, {maxCorner.x(), minCorner.y()}, maxCorner, {minCorner.x(), maxCorner.y()}, minCorner}});
             paths.push_back({path});
 
             if (h == 0.f) { // add brim
                 ExtrusionPath fakeBrim(ExtrusionRole::erBrim, 0.0, 0.0, layer_height);
                 Point         wtbminCorner = {minCorner - Point{bd, bd}};
                 Point         wtbmaxCorner = {maxCorner + Point{bd, bd}};
-                fakeBrim.polyline          = Polyline{{wtbminCorner, {wtbmaxCorner.x(), wtbminCorner.y()}, wtbmaxCorner, {wtbminCorner.x(), wtbmaxCorner.y()}, wtbminCorner}};
+                fakeBrim.polyline          = Polyline3(Polyline{{wtbminCorner, {wtbmaxCorner.x(), wtbminCorner.y()}, wtbmaxCorner, {wtbminCorner.x(), wtbmaxCorner.y()}, wtbminCorner}});
                 paths.back().push_back(fakeBrim);
             }
         }
@@ -695,13 +695,13 @@ struct FakeWipeTower
 
 
             ExtrusionPath path(ExtrusionRole::erWipeTower, 0.0, 0.0, lh);
-            path.polyline = Polyline{{ minCorner, {maxCorner.x(), minCorner.y()}, maxCorner, {minCorner.x(), maxCorner.y()}, minCorner }};
+            path.polyline = Polyline3(Polyline{{ minCorner, {maxCorner.x(), minCorner.y()}, maxCorner, {minCorner.x(), maxCorner.y()}, minCorner }});
             paths.push_back({ path });
 
             // We added the border, now add several parallel lines so we can detect an object that is fully inside the tower.
             // For now, simply use fixed spacing of 3mm.
             for (coord_t y=minCorner.y()+scale_(3.); y<maxCorner.y(); y+=scale_(3.)) {
-                path.polyline = Polyline{{ {minCorner.x(), y}, {maxCorner.x(), y} }};
+                path.polyline = Polyline3(Polyline{{ {minCorner.x(), y}, {maxCorner.x(), y} }});
                 paths.back().emplace_back(path);
             }