diff --git a/src/util/BitField.js b/src/util/BitField.js
index f849e7b8a..8de151d01 100644
--- a/src/util/BitField.js
+++ b/src/util/BitField.js
@@ -103,7 +103,7 @@ class BitField {
    */
   serialize(...hasParams) {
     const serialized = {};
-    for (const perm in this.constructor.FLAGS) serialized[perm] = this.has(perm, ...hasParams);
+    for (const [flag, bit] of Object.entries(this.constructor.FLAGS)) serialized[flag] = this.has(bit, ...hasParams);
     return serialized;
   }