diff --git a/lib/Slic3r/Fill/PlanePath.pm b/lib/Slic3r/Fill/PlanePath.pm
index 5b4b5a6ad..036d2d781 100644
--- a/lib/Slic3r/Fill/PlanePath.pm
+++ b/lib/Slic3r/Fill/PlanePath.pm
@@ -7,6 +7,7 @@ with qw(Slic3r::Fill::WithDirection);
 use Slic3r::Geometry qw(scale X1 Y1 X2 Y2);
 use Slic3r::Geometry::Clipper qw(intersection_pl);
 
+sub angles () { [0] }
 sub multiplier () { 1 }
 
 sub process_polyline {}