diff --git a/glyphs/symbol-math.ptl b/glyphs/symbol-math.ptl
index c746f98c3..849857cba 100644
--- a/glyphs/symbol-math.ptl
+++ b/glyphs/symbol-math.ptl
@@ -191,6 +191,11 @@ export : define [apply] : begin
 			include markset.plus
 			include : HBar SB RIGHTSB symbolMid OPERATORSTROKE
 			save 'minus' 0x2212
+		sketch # minus.preTurnstile
+			include markset.plus
+			include : HBar (-SB) RIGHTSB symbolMid OPERATORSTROKE
+			save 'ligminus.preTurnstile'
+			save 'lighyphen.preTurnstile'
 		sketch # innerMinus
 			include markset.plus
 			include : HBar SB RIGHTSB symbolMid GEOMETRYSTROKE
diff --git a/meta/feature/ligation.ptl b/meta/feature/ligation.ptl
index 41d5e117c..e56ae8132 100644
--- a/meta/feature/ligation.ptl
+++ b/meta/feature/ligation.ptl
@@ -132,9 +132,9 @@ export : define [buildLigations chain-rule lookupOrder commonList features looku
 			.subtables : list
 				chain-rule # (*
 					{'parenLeft'}  ~> preserved
-					{'asterisk'}   ~> [only 'brst' {'asterisk.low'}]
+					{'asterisk'}   ~> [only 'brst' {'asterisk.dfltlow'}]
 				chain-rule # *)
-					{'asterisk'}   ~> [only 'brst' {'asterisk.low'}]
+					{'asterisk'}   ~> [only 'brst' {'asterisk.dfltlow'}]
 					{'parenRight'} ~> preserved
 		# Smiley :)
 		includeLookup
@@ -476,6 +476,9 @@ export : define [buildLigations chain-rule lookupOrder commonList features looku
 			chain-rule
 				{'backslash'} ~> [only 'logic' {'backslash.left'}]
 				{'slash'}     ~> [only 'logic' {'slash.right'}]
+			chain-rule
+				{'bar'}            ~> preserved
+				{'hyphen' 'minus'} ~> [only 'logic' : lsx 'preTurnstile']
 	do "equals-3" : includeLookup
 		.type 'gsub_chaining'
 		.subtables : list