diff --git a/lib/utils.js b/lib/utils.js
index ff2f76372..dc746b02b 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -53,7 +53,8 @@ export function deserialize(valueToDeserialize) {
         if (value !== null &&
             typeof value === "object" &&
             Object.keys(value).length === 2 &&
-            Object.keys(value).every((key) => ["value", BIGINT_KEY].includes(key))) {
+            Object.keys(value).every((key) => ["value", BIGINT_KEY].includes(key)) &&
+            value[BIGINT_KEY] === BIGINT_BRAND) {
             return BigInt(value["value"]);
         }
         return value;
diff --git a/src/utils.ts b/src/utils.ts
index 09552a228..8716b6681 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -86,7 +86,8 @@ export function deserialize(valueToDeserialize: string): unknown {
       value !== null &&
       typeof value === "object" &&
       Object.keys(value).length === 2 &&
-      Object.keys(value).every((key) => ["value", BIGINT_KEY].includes(key))
+      Object.keys(value).every((key) => ["value", BIGINT_KEY].includes(key)) &&
+      value[BIGINT_KEY] === BIGINT_BRAND
     ) {
       return BigInt(value["value"]);
     }