diff --git a/lab-67/lab-67-netty-demo/lab-67-netty-demo-common/src/main/java/cn/iocoder/springboot/lab67/nettycommondemo/dispatcher/MessageHandlerContainer.java b/lab-67/lab-67-netty-demo/lab-67-netty-demo-common/src/main/java/cn/iocoder/springboot/lab67/nettycommondemo/dispatcher/MessageHandlerContainer.java
index f1b70d2a9..7790161eb 100644
--- a/lab-67/lab-67-netty-demo/lab-67-netty-demo-common/src/main/java/cn/iocoder/springboot/lab67/nettycommondemo/dispatcher/MessageHandlerContainer.java
+++ b/lab-67/lab-67-netty-demo/lab-67-netty-demo-common/src/main/java/cn/iocoder/springboot/lab67/nettycommondemo/dispatcher/MessageHandlerContainer.java
@@ -61,7 +61,7 @@ static Class<? extends Message> getMessageClass(MessageHandler handler) {
         Class<?> superclass = targetClass.getSuperclass();
         while ((Objects.isNull(interfaces) || 0 == interfaces.length) && Objects.nonNull(superclass)) { // 此处，是以父类的接口为准
             interfaces = superclass.getGenericInterfaces();
-            superclass = targetClass.getSuperclass();
+            superclass = superclass.getSuperclass();
         }
         if (Objects.nonNull(interfaces)) {
             // 遍历 interfaces 数组