diff --git a/lib/Slic3r/Perimeter.pm b/lib/Slic3r/Perimeter.pm
index 2e15c6139..723a9b1b0 100644
--- a/lib/Slic3r/Perimeter.pm
+++ b/lib/Slic3r/Perimeter.pm
@@ -98,16 +98,13 @@ sub make_perimeter {
     if ($layer->id == 0 && $Slic3r::skirts > 0) {
         # find out convex hull
         my $points = [ map { @{ $_->mgp_polygon->polygons->[0] } } @{ $layer->surfaces } ];
-        my $convex_hull = $self->_mgp_from_points_ref($points)->convexhull2;
-        my $convex_hull_polygon = ref $convex_hull eq 'ARRAY' 
-            ? $self->_mgp_from_points_ref($convex_hull)
-            : $convex_hull;
+        my $convex_hull = $self->_mgp_from_points_ref($points)->convexhull2;  # maybe Math::ConvexHull is faster?
+        my $convex_hull_points = ref $convex_hull eq 'ARRAY' ? $convex_hull : $convex_hull->points;
         
         # draw outlines from outside to inside
         for (my $i = $Slic3r::skirts - 1; $i >= 0; $i--) {
-            my $outline = $convex_hull_polygon->offset_polygon(
-                - ($Slic3r::skirt_distance + ($Slic3r::flow_width * $i)) / $Slic3r::resolution
-            );
+            my $distance = ($Slic3r::skirt_distance + ($Slic3r::flow_width * $i)) / $Slic3r::resolution;
+            my $outline = offset([$convex_hull_points], $distance, 0.1, JT_ROUND);
             push @{$outline->[0]}, $outline->[0][0]; # repeat first point as last to complete the loop
             push @{ $layer->skirts }, Slic3r::ExtrusionPath->cast([ @{$outline->[0]} ]);
         }