diff --git a/libs/canvas/canvas/poly_item.h b/libs/canvas/canvas/poly_item.h
index 3df13ff75f..dc3c61c9b2 100644
--- a/libs/canvas/canvas/poly_item.h
+++ b/libs/canvas/canvas/poly_item.h
@@ -46,8 +46,8 @@ protected:
 	Points _points;
 
 	/* these return screen-cordidates of the most recent render_path() */
-	Duple const& leftedge () const { return _left; }
-	Duple const& rightedge () const { return _right; }
+	Duple const& left_edge ()  const { return _left; }
+	Duple const& right_edge () const { return _right; }
 
 private:
 	static bool interpolate_line (Duple&, Duple const&, Coord const);
diff --git a/libs/canvas/poly_line.cc b/libs/canvas/poly_line.cc
index 7ef8e4a5aa..b1953ae4b8 100644
--- a/libs/canvas/poly_line.cc
+++ b/libs/canvas/poly_line.cc
@@ -71,17 +71,17 @@ PolyLine::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) cons
 		Duple y (0, _y1);
 		float y1 = item_to_window (y).y;
 		render_path (area, context);
-		Duple const& c0 (rightedge ());
-		Duple const& c1 (leftedge ());
-		if (c0.x < vp.x1) {
-			context->line_to (vp.x1, c0.y);
+		Duple const& c0 (left_edge ());
+		Duple const& c1 (right_edge ());
+		if (c1.x < vp.x1) {
+			context->line_to (vp.x1, c1.y);
 			context->line_to (vp.x1, y1);
 		} else {
 			context->line_to (vp.x1, y1);
 		}
-		if (c1.x > vp.x0) {
+		if (c0.x > vp.x0) {
 			context->line_to (vp.x0, y1);
-			context->line_to (vp.x0, c1.y);
+			context->line_to (vp.x0, c0.y);
 		} else {
 			context->line_to (vp.x0, y1);
 		}