diff --git a/src/client.rs b/src/client.rs
index de08ee0e6..1c6f63f36 100644
--- a/src/client.rs
+++ b/src/client.rs
@@ -420,7 +420,7 @@ impl Client {
         key: &str,
         conn: &mut Stream,
         direct: bool,
-        mut interface: impl Interface,
+        interface: impl Interface,
     ) -> ResultType<()> {
         let rs_pk = get_rs_pk(if key.is_empty() {
             hbb_common::config::RS_PUB_KEY
diff --git a/src/flutter_ffi.rs b/src/flutter_ffi.rs
index 3be0c9fed..bf5ebaf4e 100644
--- a/src/flutter_ffi.rs
+++ b/src/flutter_ffi.rs
@@ -19,7 +19,8 @@ use crate::flutter::{self, SESSIONS};
 use crate::ui_interface::{self, *};
 use crate::{
     client::file_trait::FileManager,
-    flutter::{make_fd_to_json, session_add, session_start_},
+    common::make_fd_to_json,
+    flutter::{session_add, session_start_},
 };
 fn initialize(app_dir: &str) {
     *config::APP_DIR.write().unwrap() = app_dir.to_owned();
diff --git a/src/rendezvous_mediator.rs b/src/rendezvous_mediator.rs
index 8e2e1251a..f962810a2 100644
--- a/src/rendezvous_mediator.rs
+++ b/src/rendezvous_mediator.rs
@@ -24,7 +24,7 @@ use hbb_common::{
         time::{interval, Duration},
     },
     udp::FramedSocket,
-    AddrMangle, IntoTargetAddr, ResultType, TargetAddr,
+    AddrMangle, ResultType, TargetAddr,
 };
 
 use crate::server::{check_zombie, new as new_server, ServerPtr};
diff --git a/src/tray.rs b/src/tray.rs
index b73e46301..1afd988ae 100644
--- a/src/tray.rs
+++ b/src/tray.rs
@@ -206,7 +206,7 @@ fn is_service_stoped() -> bool {
 pub fn make_tray() {
     use tray_item::TrayItem;
     let mode = dark_light::detect();
-    let mut icon_path = "";
+    let icon_path;
     match mode {
         dark_light::Mode::Dark => {
             icon_path = "mac-tray-light.png";
diff --git a/src/ui.rs b/src/ui.rs
index 4adb018c8..d45a64298 100644
--- a/src/ui.rs
+++ b/src/ui.rs
@@ -11,7 +11,6 @@ use hbb_common::{
     allow_err,
     config::{self, PeerConfig},
     log,
-    rendezvous_proto::*,
 };
 
 use crate::common::get_app_name;