diff --git a/src/modules/utilities.js b/src/modules/utilities.js
index 950288b..8685aa9 100644
--- a/src/modules/utilities.js
+++ b/src/modules/utilities.js
@@ -37,7 +37,7 @@ function Enum(...labels) {
   const e = {}
   let i = 0
   for (const label of labels) {
-    e[e[label] = i] = label;
+    e[e[label] = i++] = label;
   }
   return e
 }