diff --git a/servlet/rpc-servlet.go b/servlet/rpc-servlet.go
index ab06fc2..fdc2660 100644
--- a/servlet/rpc-servlet.go
+++ b/servlet/rpc-servlet.go
@@ -80,7 +80,7 @@ func (s *RPCServlets) Handle(servletCtx server.ServletCtx,
 
 	if nil != _clientType && nil != _sessionID && nil != _targetID {
 		md = metadata.Pairs(
-			oe.GRPCClientTypeKey.String(), _clientType.(og.ClientType).String(),
+			oe.GRPCClientTypeKey.String(), _clientType.(oe.ClientType).String(),
 			oe.GRPCSessionIDKey.String(), _sessionID.(string),
 			oe.GRPCTargetIDKey.String(), _targetID.(string),
 		)