diff --git a/src/api/results.rs b/src/api/results.rs
index 56cf8bb..4380d9f 100644
--- a/src/api/results.rs
+++ b/src/api/results.rs
@@ -508,7 +508,7 @@ impl CopyEncoder {
                         b'\\' => {
                             self.buffer.put_slice(b"\\\\");
                         }
-                        b if byte == delimiter.as_bytes()[0] => {
+                        _b if byte == delimiter.as_bytes()[0] => {
                             self.buffer.put_u8(b'\\');
                             self.buffer.put_u8(byte);
                         }