diff --git a/spring-cloud-alibaba-nacos-discovery/src/main/java/org/springframework/cloud/alibaba/nacos/NacosDiscoveryProperties.java b/spring-cloud-alibaba-nacos-discovery/src/main/java/org/springframework/cloud/alibaba/nacos/NacosDiscoveryProperties.java
index 11ea34753..a86b24d61 100644
--- a/spring-cloud-alibaba-nacos-discovery/src/main/java/org/springframework/cloud/alibaba/nacos/NacosDiscoveryProperties.java
+++ b/spring-cloud-alibaba-nacos-discovery/src/main/java/org/springframework/cloud/alibaba/nacos/NacosDiscoveryProperties.java
@@ -167,7 +167,7 @@ public class NacosDiscoveryProperties {
 
 		serverAddr = Objects.toString(serverAddr, "");
 		if (serverAddr.lastIndexOf("/") != -1) {
-			serverAddr.substring(0, serverAddr.length() - 1);
+			serverAddr = serverAddr.substring(0, serverAddr.length() - 1);
 		}
 		endpoint = Objects.toString(endpoint, "");
 		namespace = Objects.toString(namespace, "");