diff --git a/glyphs/letters-unified-basic.aki b/glyphs/letters-unified-basic.aki
index 5815571..518cc93 100644
--- a/glyphs/letters-unified-basic.aki
+++ b/glyphs/letters-unified-basic.aki
@@ -733,7 +733,7 @@ symbol-block 'y'
 		
 		if SLAB : begin
 			include : AIVSerifs top
-			include : LeftwardBottomSerif xbottom bottom (SIDEJUT + JUT / 4)
+			include : tagged 'serifB' : LeftwardBottomSerif xbottom bottom (SIDEJUT + JUT / 4)
 			
 	create-glyph 'y.upright' : glyph-construction
 		include pMarks
@@ -766,6 +766,7 @@ symbol-block 'y'
 		include glyphs.'y.upright' AS_BASE
 		eject-contour 'strokeR'
 		eject-contour 'serifRT'
+		eject-contour 'serifB'
 		local xbottom : mix SB RIGHTSB [linreg 18 0.36 108 0.27 STROKE]
 		include : dispiro
 			widths.center
@@ -775,6 +776,8 @@ symbol-block 'y'
 			g2   (RIGHTSB - HOOKX / 6) [mix DESCENDER (XH - HALFSTROKE) 0.98]
 			flat (RIGHTSB + HOOKX / 4 - 1) (XH - HALFSTROKE)
 			curl (RIGHTSB + HOOKX / 4) (XH - HALFSTROKE)
+		if SLAB : begin
+			include : tagged 'serifB' : LeftwardBottomSerif xbottom DESCENDER (SIDEJUT + JUT / 4)
 	
 	create-glyph 'cyrU' : glyph-construction
 		assign-unicode 0x423