diff --git a/lib/Slic3r/GUI/Plater.pm b/lib/Slic3r/GUI/Plater.pm
index 1144e507..933dbcb2 100644
--- a/lib/Slic3r/GUI/Plater.pm
+++ b/lib/Slic3r/GUI/Plater.pm
@@ -877,7 +877,7 @@ sub repaint {
             # if sequential printing is enabled and we have more than one object
             if ($parent->{config}->complete_objects && (map @{$_->instances}, @{$parent->{objects}}) > 1) {
             	my $convex_hull = Slic3r::Polygon->new(convex_hull([ map @{$_->contour}, @{$parent->{object_previews}->[-1][2]->expolygons} ]));
-                my ($clearance) = offset([$convex_hull], $parent->{config}->extruder_clearance_radius / 2 * $parent->{scaling_factor}, 1, JT_ROUND);
+                my ($clearance) = @{offset([$convex_hull], $parent->{config}->extruder_clearance_radius / 2 * $parent->{scaling_factor}, 100, JT_ROUND)};
                 $dc->SetPen($parent->{clearance_pen});
                 $dc->SetBrush($parent->{transparent_brush});
                 $dc->DrawPolygon($parent->_y($clearance), 0, 0);
@@ -888,7 +888,7 @@ sub repaint {
     # draw skirt
     if (@{$parent->{object_previews}} && $parent->{config}->skirts) {
         my $convex_hull = Slic3r::Polygon->new(convex_hull([ map @{$_->contour}, map @{$_->[2]->expolygons}, @{$parent->{object_previews}} ]));
-        ($convex_hull) = offset([$convex_hull], $parent->{config}->skirt_distance * $parent->{scaling_factor}, 1, JT_ROUND);
+        ($convex_hull) = @{offset([$convex_hull], $parent->{config}->skirt_distance * $parent->{scaling_factor}, 100, JT_ROUND)};
         $dc->SetPen($parent->{skirt_pen});
         $dc->SetBrush($parent->{transparent_brush});
         $dc->DrawPolygon($parent->_y($convex_hull), 0, 0) if $convex_hull;