diff --git a/glyphs/symbol-geometric.patel b/glyphs/symbol-geometric.patel
index 199e23e..829d429 100644
--- a/glyphs/symbol-geometric.patel
+++ b/glyphs/symbol-geometric.patel
@@ -29,9 +29,10 @@ create-glyph 'pwlTriangleRight' : glyph-construction {
 }
 create-glyph 'pwlAngleRight' : glyph-construction {
 	assign-unicode 0xE0B1
+	local fine : adviceBlackness 4
 	include : create-stroke
 		:.start-from 0 font.hhea.ascent
-		:.set-width  [HALFSTROKE * 0.5] [HALFSTROKE * 0.5]
+		:.set-width  [fine / 2] [fine / 2]
 		:.line-to    WIDTH [mix font.hhea.ascent font.hhea.descent 0.5]
 		:.line-to    0 font.hhea.descent
 }