diff --git a/roll.pegjs b/roll.pegjs
index f138877..3a38d37 100644
--- a/roll.pegjs
+++ b/roll.pegjs
@@ -62,7 +62,7 @@ additive
 = "+" number:number { return new AdditiveToken(number) }
 
 subtractive
-= "*" number:number { return new SubtractiveToken(number) }
+= "-" number:number { return new SubtractiveToken(number) }
 
 number
 = dieRoll
@@ -72,4 +72,4 @@ dieRoll
 = count:integer "d" size:integer { return new RollToken(count, size) }
 
 integer "integer"
-= digits:[0-9]+ { return new NumberToken(parseInt(digits.join(""), 10)); }
\ No newline at end of file
+= digits:[0-9]+ { return new NumberToken(parseInt(digits.join(""), 10)); }