diff --git a/crates/rust-analyzer/src/flycheck.rs b/crates/rust-analyzer/src/flycheck.rs
index c2b943d1d6..168f9702d1 100644
--- a/crates/rust-analyzer/src/flycheck.rs
+++ b/crates/rust-analyzer/src/flycheck.rs
@@ -109,7 +109,7 @@ pub(crate) struct FlycheckHandle {
 impl FlycheckHandle {
     pub(crate) fn spawn(
         id: usize,
-        sender: Box<dyn Fn(FlycheckMessage) + Send>,
+        sender: Sender<FlycheckMessage>,
         config: FlycheckConfig,
         sysroot_root: Option<AbsPathBuf>,
         workspace_root: AbsPathBuf,
@@ -199,7 +199,7 @@ enum StateChange {
 struct FlycheckActor {
     /// The workspace id of this flycheck instance.
     id: usize,
-    sender: Box<dyn Fn(FlycheckMessage) + Send>,
+    sender: Sender<FlycheckMessage>,
     config: FlycheckConfig,
     manifest_path: Option<AbsPathBuf>,
     /// Either the workspace root of the workspace we are flychecking,
@@ -235,7 +235,7 @@ pub(crate) const SAVED_FILE_PLACEHOLDER: &str = "$saved_file";
 impl FlycheckActor {
     fn new(
         id: usize,
-        sender: Box<dyn Fn(FlycheckMessage) + Send>,
+        sender: Sender<FlycheckMessage>,
         config: FlycheckConfig,
         sysroot_root: Option<AbsPathBuf>,
         workspace_root: AbsPathBuf,
@@ -479,7 +479,7 @@ impl FlycheckActor {
     }
 
     fn send(&self, check_task: FlycheckMessage) {
-        (self.sender)(check_task);
+        self.sender.send(check_task).unwrap();
     }
 }
 
diff --git a/crates/rust-analyzer/src/reload.rs b/crates/rust-analyzer/src/reload.rs
index e432f5d5cf..dee34b1b39 100644
--- a/crates/rust-analyzer/src/reload.rs
+++ b/crates/rust-analyzer/src/reload.rs
@@ -758,7 +758,7 @@ impl GlobalState {
         self.flycheck = match invocation_strategy {
             crate::flycheck::InvocationStrategy::Once => vec![FlycheckHandle::spawn(
                 0,
-                Box::new(move |msg| sender.send(msg).unwrap()),
+                sender,
                 config,
                 None,
                 self.config.root_path().clone(),
@@ -793,10 +793,9 @@ impl GlobalState {
                         ))
                     })
                     .map(|(id, (root, manifest_path), sysroot_root)| {
-                        let sender = sender.clone();
                         FlycheckHandle::spawn(
                             id,
-                            Box::new(move |msg| sender.send(msg).unwrap()),
+                            sender.clone(),
                             config.clone(),
                             sysroot_root,
                             root.to_path_buf(),