diff --git a/protocol/src/main/resources/typescript/buffer/Longbits.ts b/protocol/src/main/resources/typescript/buffer/Longbits.ts
index a538cace5..3bb8a20d7 100644
--- a/protocol/src/main/resources/typescript/buffer/Longbits.ts
+++ b/protocol/src/main/resources/typescript/buffer/Longbits.ts
@@ -43,7 +43,7 @@ class Longbits {
   /**
    * Converts this long bits to a long.
    */
-  toLong(unsigned): Long {
+  toLong(unsigned: boolean): Long {
     return new Long(this.lo | 0, this.hi | 0, Boolean(unsigned));
   };
 
diff --git a/protocol/src/test/java/com/zfoo/protocol/packet/NormalObject.java b/protocol/src/test/java/com/zfoo/protocol/packet/NormalObject.java
index ffe088337..81d84ac83 100644
--- a/protocol/src/test/java/com/zfoo/protocol/packet/NormalObject.java
+++ b/protocol/src/test/java/com/zfoo/protocol/packet/NormalObject.java
@@ -60,6 +60,8 @@ public class NormalObject {
 
 //    @Compatible(1)
 //    public int outCompatibleValue;
+//    @Compatible(2)
+//    public int outCompatibleValue2;
 
     public byte getA() {
         return a;