diff --git a/font-src/glyphs/marks/above.ptl b/font-src/glyphs/marks/above.ptl
index 4a45db3fc..4bf635a86 100644
--- a/font-src/glyphs/marks/above.ptl
+++ b/font-src/glyphs/marks/above.ptl
@@ -892,7 +892,7 @@ glyph-block Mark-Above : begin
 		local turnSlope : 0.5 * ((markStroke - fine) / markStroke - (ArchDepthB - ArchDepth) / ArchDepth)
 
 		include : intersection
-			MaskAbove XH
+			MaskAbove (XH + O)
 			dispiro
 				g4 (markMiddle + [mix extR (-extL) 0.75]) XH [widths.rhs.heading fine Rightward]
 				alsoThru 0.5 (0.375 - 0.2 * markStroke / depth) [widths.rhs : mix fine markStroke 0.25]