diff --git a/src/line_buffer.rs b/src/line_buffer.rs
index de80a55..8811888 100644
--- a/src/line_buffer.rs
+++ b/src/line_buffer.rs
@@ -673,7 +673,7 @@
 
     fn drain(&mut self, range: Range<usize>, dir: Direction) -> Drain {
         for dl in &self.dl {
-            let mut lock = dl.try_lock();
+            let lock = dl.try_lock();
             if let Ok(mut dl) = lock {
                 dl.delete(range.start, &self.buf[range.start..range.end], dir);
             }