diff --git a/packages/core/src/material/enums/Refraction.ts b/packages/core/src/material/enums/Refraction.ts
index e043ad6f49..0e47b1fb53 100644
--- a/packages/core/src/material/enums/Refraction.ts
+++ b/packages/core/src/material/enums/Refraction.ts
@@ -3,9 +3,9 @@
  */
 export enum RefractionMode {
   /** Refraction shape is sphere. */
-  Sphere,
+  Sphere = 0,
   /** Refraction shape is plane. */
-  Plane,
+  Plane = 1,
   /** Refraction shape is thin. */
-  Thin
+  Thin = 2
 }