diff --git a/protocol/src/main/java/com/zfoo/protocol/serializer/typescript/GenerateTsUtils.java b/protocol/src/main/java/com/zfoo/protocol/serializer/typescript/GenerateTsUtils.java
index 52e16f36f..3fa82a9a8 100644
--- a/protocol/src/main/java/com/zfoo/protocol/serializer/typescript/GenerateTsUtils.java
+++ b/protocol/src/main/java/com/zfoo/protocol/serializer/typescript/GenerateTsUtils.java
@@ -205,7 +205,7 @@ private static String readObject(ProtocolRegistration registration) {
             var field = fields[i];
             var fieldRegistration = fieldRegistrations[i];
             if (field.isAnnotationPresent(Compatible.class)) {
-                tsBuilder.append(TAB + TAB).append("if (buffer.compatibleRead(beforeReadIndex, length)) {").append(LS);
+                tsBuilder.append(TAB + TAB).append("if (!buffer.compatibleRead(beforeReadIndex, length)) {").append(LS);
                 var compatibleReadObject = tsSerializer(fieldRegistration.serializer()).readObject(tsBuilder, 3, field, fieldRegistration);
                 tsBuilder.append(TAB + TAB+ TAB).append(StringUtils.format("packet.{} = {};", field.getName(), compatibleReadObject)).append(LS);
                 tsBuilder.append(TAB + TAB).append("}").append(LS);