diff --git a/mybatis-plus-core/src/main/java/com/baomidou/mybatisplus/core/handlers/IJsonTypeHandler.java b/mybatis-plus-core/src/main/java/com/baomidou/mybatisplus/core/handlers/IJsonTypeHandler.java
index 3666bad74..49f5de58e 100644
--- a/mybatis-plus-core/src/main/java/com/baomidou/mybatisplus/core/handlers/IJsonTypeHandler.java
+++ b/mybatis-plus-core/src/main/java/com/baomidou/mybatisplus/core/handlers/IJsonTypeHandler.java
@@ -50,6 +50,6 @@ public interface IJsonTypeHandler<T> {
      * @param obj 对象信息
      * @return json字符串
      */
-    String toJson(Object obj);
+    String toJson(T obj);
 
 }