diff --git a/interop/src/arkts/DeserializerBase.ts b/interop/src/arkts/DeserializerBase.ts
index 2f6d36a368ca28ca26490d35c2613e03422454da..e43586e93ddac4094c8b2d36650f634686162271 100644
--- a/interop/src/arkts/DeserializerBase.ts
+++ b/interop/src/arkts/DeserializerBase.ts
@@ -163,7 +163,7 @@ export class DeserializerBase implements Disposable {
 
         this._position = newPos
         const value = unsafeMemory.readInt8(pos);
-        if (value == Tags.UNDEFINED)
+        if (value == Tags.UNDEFINED.valueOf())
             return false;
 
         return value == 1