diff --git a/lib/Slic3r/Fill.pm b/lib/Slic3r/Fill.pm
index 152932da7..e30eec65f 100644
--- a/lib/Slic3r/Fill.pm
+++ b/lib/Slic3r/Fill.pm
@@ -185,7 +185,7 @@ sub make_fill {
         );
         push @fills, map {
             $_->isa('Slic3r::Polygon')
-                ? Slic3r::ExtrusionLoop->pack(polygon  => $_, %args)->split_at_first_point
+                ? (map $_->pack, Slic3r::ExtrusionLoop->new(polygon  => $_, %args)->split_at_first_point)
                 : Slic3r::ExtrusionPath->pack(polyline => $_, %args),
         } @{$layer->thin_fills};
     }