diff --git a/big.js/big.js.d.ts b/big.js/big.js.d.ts
index 0e4ac48be..d4ca239e3 100644
--- a/big.js/big.js.d.ts
+++ b/big.js/big.js.d.ts
@@ -6,7 +6,7 @@
 
 declare module BigJsLibrary {
 
-    export enum RoundingMode {
+    export const enum RoundingMode {
         RoundTowardsZero = 0,
         RoundTowardsNearestAwayFromZero = 1,
         RoundTowardsNearestTowardsEven = 2,
@@ -200,4 +200,4 @@ declare module BigJsLibrary {
     }
 }
 
-declare var Big: BigJsLibrary.BigJS;
\ No newline at end of file
+declare var Big: BigJsLibrary.BigJS;