diff --git a/src/Lib/Polygon/Makefile.am b/src/Lib/Polygon/Makefile.am
index 51015c79..f162bb31 100644
--- a/src/Lib/Polygon/Makefile.am
+++ b/src/Lib/Polygon/Makefile.am
@@ -4,6 +4,7 @@ libPolygon_a_SOURCES = \
 	index.cxx index.hxx \
 	names.cxx names.hxx \
 	polygon.cxx polygon.hxx \
-	split.cxx split.hxx
+	split.cxx split.hxx \
+	superpoly.cxx superpoly.hxx
 
 INCLUDES += -I$(top_builddir)/src -I$(top_builddir)/src/Lib
diff --git a/src/Lib/Polygon/polygon.hxx b/src/Lib/Polygon/polygon.hxx
index 23904be6..e6ddd8fb 100644
--- a/src/Lib/Polygon/polygon.hxx
+++ b/src/Lib/Polygon/polygon.hxx
@@ -65,6 +65,7 @@ public:
     // Add a contour
     inline void add_contour( const point_list contour, const int hole_flag ) {
 	poly.push_back( contour );
+	inside_list.push_back( Point3D( 0.0 ) );
 	hole_list.push_back( hole_flag );
     }
 
@@ -78,6 +79,9 @@ public:
 	polytype_iterator start_poly = poly.begin();
 	poly.erase( start_poly + i );
 
+	point_list_iterator start_inside = inside_list.begin();
+	inside_list.erase( start_inside + i );
+
 	int_list_iterator start_hole = hole_list.begin();
 	hole_list.erase( start_hole + i );
     }