diff --git a/src/dsp408/mapper/response.rs b/src/dsp408/mapper/response.rs
index 68a719f..009842b 100644
--- a/src/dsp408/mapper/response.rs
+++ b/src/dsp408/mapper/response.rs
@@ -217,8 +217,6 @@ pub fn map_response(frame: &Frame) -> Result<DeviceResponseType, ProtocolError>
 
 #[cfg(test)]
 mod tests {
-    use std::sync::mpsc::channel;
-
     use super::*;
 
     fn frame(command: u8, payload: Vec<u8>) -> Frame {