diff --git a/dubbo-rpc-default/src/main/java/com/alibaba/dubbo/rpc/protocol/dubbo/DubboCodec.java b/dubbo-rpc-default/src/main/java/com/alibaba/dubbo/rpc/protocol/dubbo/DubboCodec.java
index 87ce2796b94c12c9efd2623c9b79f17cacbbc661..76540b7f6b0bbbe9bd15cc3513812d36a3ca7c2d 100644
--- a/dubbo-rpc-default/src/main/java/com/alibaba/dubbo/rpc/protocol/dubbo/DubboCodec.java
+++ b/dubbo-rpc-default/src/main/java/com/alibaba/dubbo/rpc/protocol/dubbo/DubboCodec.java
@@ -171,6 +171,9 @@ public class DubboCodec extends ExchangeCodec implements Codec {
                     try {
                         if (channel != null && invocation != null) {
                             String service = invocation.getAttachment(Constants.INTERFACE_KEY);
+                            if (service == null || service.length() == 0) {
+                                service = invocation.getAttachment(Constants.PATH_KEY);
+                            }
                             if (service != null && service.length() > 0) {
                                 Class<?> cls = ReflectUtils.forName(service);
                                 Method method = cls.getMethod(invocation.getMethodName(), invocation.getParameterTypes());