diff --git a/protocols/relay/src/behaviour.rs b/protocols/relay/src/behaviour.rs
index 90858e07..81fe6da8 100644
--- a/protocols/relay/src/behaviour.rs
+++ b/protocols/relay/src/behaviour.rs
@@ -99,6 +99,7 @@ enum IncomingRelayReq {
     },
 }
 
+#[derive(Debug)]
 pub struct RelayConfig {
     /// How long to keep connections alive when they're idle.
     ///