diff --git a/decimal.js/decimal.js.d.ts b/decimal.js/decimal.js.d.ts
index 60cf84a98a..f0e357e95d 100644
--- a/decimal.js/decimal.js.d.ts
+++ b/decimal.js/decimal.js.d.ts
@@ -74,7 +74,7 @@ declare module decimal {
         groupSeparator?: string;
         groupSize?: number;
         secondaryGroupSize?: number;
-        fractionGroupSelector?: string;
+        fractionGroupSeparator?: string;
         fractionGroupSize?: number;
     }