diff --git a/vexflow/vexflow.d.ts b/vexflow/vexflow.d.ts
index b1911eb6d..5f450190a 100644
--- a/vexflow/vexflow.d.ts
+++ b/vexflow/vexflow.d.ts
@@ -188,7 +188,7 @@ declare module Vex {
         }
         
         export module Barline {
-            enum type {SINGLE, DOUBLE, END, REPEAT_BEGIN, REPEAT_END, REPEAT_BOTH, NONE}
+            const enum type {SINGLE, DOUBLE, END, REPEAT_BEGIN, REPEAT_END, REPEAT_BOTH, NONE}
         }
         
         class Barline extends StaveModifier {