diff --git a/client/src/main/java/com/alibaba/nacos/client/config/impl/ServerListManager.java b/client/src/main/java/com/alibaba/nacos/client/config/impl/ServerListManager.java
index 85149fea636..760516eab23 100644
--- a/client/src/main/java/com/alibaba/nacos/client/config/impl/ServerListManager.java
+++ b/client/src/main/java/com/alibaba/nacos/client/config/impl/ServerListManager.java
@@ -254,8 +254,8 @@ private void initAddressServerUrl(Properties properties) {
                         ContextPathUtil.normalizeContextPath(this.contentPath), this.serverListName));
         boolean hasQueryString = false;
         if (StringUtils.isNotBlank(namespace)) {
-            addressServerUrlTem.append("?namespace=" + namespace);
-            hasQueryString = false;
+            addressServerUrlTem.append("?namespace=").append(namespace);
+            hasQueryString = true;
         }
         if (properties != null && properties.containsKey(PropertyKeyConst.ENDPOINT_QUERY_PARAMS)) {
             addressServerUrlTem