diff --git a/lib/Slic3r/ExPolygon.pm b/lib/Slic3r/ExPolygon.pm
index 803bf20dcf..3cb7c8ee18 100644
--- a/lib/Slic3r/ExPolygon.pm
+++ b/lib/Slic3r/ExPolygon.pm
@@ -121,7 +121,7 @@ sub encloses_point {
 sub encloses_point_quick {
     my $self = shift;
     my ($point) = @_;
-    return Boost::Geometry::Utils::point_within_polygon($point, $self);
+    return Boost::Geometry::Utils::point_within_polygon($point, $self->arrayref);
 }
 
 sub encloses_line {