diff --git a/core/src/main/java/com/alibaba/fastjson2/writer/ObjectWriterProvider.java b/core/src/main/java/com/alibaba/fastjson2/writer/ObjectWriterProvider.java
index 3fde6d1742..d991fad09d 100644
--- a/core/src/main/java/com/alibaba/fastjson2/writer/ObjectWriterProvider.java
+++ b/core/src/main/java/com/alibaba/fastjson2/writer/ObjectWriterProvider.java
@@ -8,10 +8,7 @@
 import com.alibaba.fastjson2.modules.ObjectCodecProvider;
 import com.alibaba.fastjson2.modules.ObjectWriterAnnotationProcessor;
 import com.alibaba.fastjson2.modules.ObjectWriterModule;
-import com.alibaba.fastjson2.util.BeanUtils;
-import com.alibaba.fastjson2.util.GuavaSupport;
-import com.alibaba.fastjson2.util.JDKUtils;
-import com.alibaba.fastjson2.util.TypeUtils;
+import com.alibaba.fastjson2.util.*;
 
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
@@ -447,6 +444,8 @@ private ObjectWriter getObjectWriterInternal(Type objectType, Class objectClass,
             case "android.net.Uri$StringUri":
                 objectWriter = ObjectWriterImplToString.INSTANCE;
                 break;
+            case "com.clickhouse.data.value.UnsignedLong":
+                objectWriter = new ObjectWriterImplToString(true);
             default:
                 break;
         }
diff --git a/extension/pom.xml b/extension/pom.xml
index 68897a8e02..fbd1884653 100644
--- a/extension/pom.xml
+++ b/extension/pom.xml
@@ -149,6 +149,13 @@
             <version>${fastjson1x.version}</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>com.clickhouse</groupId>
+            <artifactId>clickhouse-jdbc</artifactId>
+            <version>0.6.5</version>
+            <classifier>http</classifier>
+            <scope>test</scope>
+        </dependency>
         <dependency>
             <groupId>com.fasterxml.jackson.datatype</groupId>
             <artifactId>jackson-datatype-jsr310</artifactId>
diff --git a/extension/src/test/java/com/alibaba/fastjson2/issues/Issue2958.java b/extension/src/test/java/com/alibaba/fastjson2/issues/Issue2958.java
new file mode 100644
index 0000000000..fc54f8c984
--- /dev/null
+++ b/extension/src/test/java/com/alibaba/fastjson2/issues/Issue2958.java
@@ -0,0 +1,19 @@
+package com.alibaba.fastjson2.issues;
+
+import com.alibaba.fastjson2.JSON;
+import com.clickhouse.data.value.UnsignedLong;
+import org.junit.jupiter.api.Test;
+
+import java.math.BigInteger;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class Issue2958 {
+    @Test
+    public void test() throws Exception {
+        String str = "9223372036854775808";
+        UnsignedLong unsignedLong = UnsignedLong.valueOf(new BigInteger(str));
+        String json = JSON.toJSONString(unsignedLong);
+        assertEquals(str, json);
+    }
+}