diff --git a/changes/16.8.1.md b/changes/16.8.1.md
index 24a930f7b..4ed3f26b3 100644
--- a/changes/16.8.1.md
+++ b/changes/16.8.1.md
@@ -1 +1,2 @@
 * Fix shape of attached descenders (#1467, #1469).
+* Fix shape of MODIFIER BREVE WITH INVERTED BREVE #1468 (`U+AB5B`) (#1468).
\ No newline at end of file
diff --git a/font-src/glyphs/symbol/letter.ptl b/font-src/glyphs/symbol/letter.ptl
index cf6f90cf1..de530a995 100644
--- a/font-src/glyphs/symbol/letter.ptl
+++ b/font-src/glyphs/symbol/letter.ptl
@@ -255,3 +255,25 @@ glyph-block Symbol-Letter-Punctuation-Composite : begin
 
 	derive-composites 'LDot' 0x13F 'L' 'LDotDot'
 	derive-composites 'lDot' 0x140 'lDotBase' 'LDotDot'
+
+
+glyph-block Symbol-Letter-Phonetic : begin
+	create-glyph 'modifierArchBreve' 0xAB5B : glyph-proc
+		include : MarkSet.e
+		local archHeight : XH * 0.45
+
+		include : dispiro
+			widths.rhs
+			g4.up.start (SB + OX) 0 [heading Upward]
+			arcvh
+			g4.right.mid (Middle - CorrectionOMidS) archHeight
+			archv
+			g4.down.end (RightSB - OX) 0 [heading Downward]
+
+		include : dispiro
+			widths.lhs
+			g4.down.start (SB + OX) XH [heading Downward]
+			arcvh
+			g4.right.mid (Middle + CorrectionOMidS) (XH - archHeight)
+			archv
+			g4.up.end (RightSB - OX) XH [heading Upward]
diff --git a/font-src/meta/unicode-knowledge.ptl b/font-src/meta/unicode-knowledge.ptl
index a4aa36851..5219ff1a9 100644
--- a/font-src/meta/unicode-knowledge.ptl
+++ b/font-src/meta/unicode-knowledge.ptl
@@ -101,7 +101,6 @@ export : define decompOverrides : object
 	0x1ffe { 'markBaseSpace' 'revCommaAbove' }
 	0x2E2F { 'markBaseSpace' 'yerikAbove' }
 	0xA788 { 'markBaseSpace' 'circumflexBelow' }
-	0xAB5B { 'markBaseSpace' 'archAbove' 'breveAbove' }
 	0xAB6A { 'markBaseSpace' 'leftTackOver' }
 	0xAB6B { 'markBaseSpace' 'rightTackOver' }