diff --git a/src/runtime/mod.rs b/src/runtime/mod.rs
index c522a7397a83c029a0eabe85233498d0e844c7e0..58df7c21a5e9985f55c09a7988f0e6649b6ebd6a 100644
--- a/src/runtime/mod.rs
+++ b/src/runtime/mod.rs
@@ -280,7 +280,7 @@ impl RuntimeInner {
     /// then it is scheduled for execution.
     pub(crate) fn send_message_maybe_destroyed(&self, target_id: ConnectorId, message: Message) -> bool {
         let target = {
-            let mut lock = self.connectors.read().unwrap();
+            let lock = self.connectors.read().unwrap();
             lock.get(target_id.index)
         };