diff --git a/src/client.rs b/src/client.rs
index c880c2dbe..44d3e0201 100644
--- a/src/client.rs
+++ b/src/client.rs
@@ -24,6 +24,7 @@ use sha2::{Digest, Sha256};
 use uuid::Uuid;
 
 pub use file_trait::FileManager;
+#[cfg(not(feature = "flutter"))]
 #[cfg(not(any(target_os = "android", target_os = "ios")))]
 use hbb_common::tokio::sync::mpsc::UnboundedSender;
 use hbb_common::{
@@ -58,10 +59,10 @@ use crate::{
 };
 
 #[cfg(not(any(target_os = "android", target_os = "ios")))]
-use crate::{
-    common::{check_clipboard, ClipboardContext, CLIPBOARD_INTERVAL},
-    ui_session_interface::SessionPermissionConfig,
-};
+use crate::common::{check_clipboard, ClipboardContext, CLIPBOARD_INTERVAL};
+#[cfg(not(feature = "flutter"))]
+#[cfg(not(any(target_os = "android", target_os = "ios")))]
+use crate::ui_session_interface::SessionPermissionConfig;
 
 pub use super::lang::*;
 
diff --git a/src/client/io_loop.rs b/src/client/io_loop.rs
index 735a35e3a..d5143c0a8 100644
--- a/src/client/io_loop.rs
+++ b/src/client/io_loop.rs
@@ -1,7 +1,5 @@
 use std::collections::HashMap;
 use std::num::NonZeroI64;
-#[cfg(not(any(target_os = "android", target_os = "ios")))]
-use std::sync::Mutex;
 use std::sync::{
     atomic::{AtomicUsize, Ordering},
     Arc,