diff --git a/src/transport.rs b/src/transport.rs
index 3a4660627f..b1ca3f8b80 100644
--- a/src/transport.rs
+++ b/src/transport.rs
@@ -54,7 +54,7 @@ pub trait SmartSubtransport: Send + 'static {
 }
 
 /// Actions that a smart transport can ask a subtransport to perform
-#[derive(Copy, Clone, PartialEq)]
+#[derive(Copy, Clone, PartialEq, Debug)]
 #[allow(missing_docs)]
 pub enum Service {
     UploadPackLs,