diff --git a/sfsmcd/src/ifaces/traits.rs b/sfsmcd/src/ifaces/traits.rs
index 433e89a..551731b 100644
--- a/sfsmcd/src/ifaces/traits.rs
+++ b/sfsmcd/src/ifaces/traits.rs
@@ -1,10 +1,11 @@
+use tokio::task::JoinHandle;
 use super::errors::ServiceError;
 pub trait org_ddnss_sfs_mc_Service {
 
-    fn start(&mut self) -> Result<tokio::task::JoinHandle<()>, ServiceError>;
-    fn stop(&mut self) -> Result<(), ServiceError>;
+    fn start(&mut self) -> Result<Option<JoinHandle<()>>, ServiceError>;
+    fn stop(&mut self) -> Result<Option<JoinHandle<()>>, ServiceError>;
     fn is_running(&self) -> bool;
-    fn restart(&mut self) -> Result<tokio::task::JoinHandle<()>, ServiceError> {
+    fn restart(&mut self) -> Result<Option<JoinHandle<()>>, ServiceError> {
         if self.is_running() {
             self.stop()?;
         }