diff --git a/apm-sniffer/apm-sdk-plugin/spring-plugins/webflux-5.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/spring/webflux/v5/RequestMappingMethodInterceptor.java b/apm-sniffer/apm-sdk-plugin/spring-plugins/webflux-5.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/spring/webflux/v5/RequestMappingMethodInterceptor.java
index 230e72044..17d5697e1 100644
--- a/apm-sniffer/apm-sdk-plugin/spring-plugins/webflux-5.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/spring/webflux/v5/RequestMappingMethodInterceptor.java
+++ b/apm-sniffer/apm-sdk-plugin/spring-plugins/webflux-5.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/spring/webflux/v5/RequestMappingMethodInterceptor.java
@@ -39,7 +39,7 @@ public class RequestMappingMethodInterceptor extends AbstractMethodInterceptor {
                     requestURL.append(",");
                 }
             }
-            requestURL = new StringBuilder("}");
+            requestURL.append("}");
         }
         if (methodRequestMapping.value().length > 0) {
             requestURL.append(methodRequestMapping.value()[0]);