diff --git a/changes/30.1.1.md b/changes/30.1.1.md
new file mode 100644
index 000000000..d71702b01
--- /dev/null
+++ b/changes/30.1.1.md
@@ -0,0 +1 @@
+* Fix broken Cyrillic Ef (#2343).
diff --git a/packages/font-glyphs/src/common/shapes.ptl b/packages/font-glyphs/src/common/shapes.ptl
index e3121b932..4ba085cf7 100644
--- a/packages/font-glyphs/src/common/shapes.ptl
+++ b/packages/font-glyphs/src/common/shapes.ptl
@@ -234,7 +234,7 @@ glyph-block CommonShapes : begin
 				flat (r - OX) (d + ada)
 				curl (r - OX) (u - adb)
 				arcvh
-				arch.lhs.centerAt.rtl.t (middle - gap / 2) u (sw -- width) (knot-ty -- flat)
+				arch.lhs.centerAt.rtl.t (middle + gap / 2) u (sw -- width) (knot-ty -- flat)
 				arch.lhs.centerAt.rtl.t middle u (sw -- width) (knot-ty -- curl)
 		: else : begin
 			local ymiddlea : mix d u (adb / (ada + adb))
@@ -250,7 +250,7 @@ glyph-block CommonShapes : begin
 				archv
 				g4 (r - OX) ymiddleb
 				arcvh
-				arch.lhs.centerAt.rtl.t (middle - gap / 2) u (sw -- width) (knot-ty -- flat)
+				arch.lhs.centerAt.rtl.t (middle + gap / 2) u (sw -- width) (knot-ty -- flat)
 				arch.lhs.centerAt.rtl.t middle u (sw -- width) (knot-ty -- curl)
 
 	glyph-block-export HSerif