diff --git a/swarm/src/handler.rs b/swarm/src/handler.rs
index cf8b9c1f2cb9..f48021a57979 100644
--- a/swarm/src/handler.rs
+++ b/swarm/src/handler.rs
@@ -457,7 +457,7 @@ impl<TUpgrErr> ConnectionHandlerUpgrErr<TUpgrErr> {
 
 impl<TUpgrErr> fmt::Display for ConnectionHandlerUpgrErr<TUpgrErr>
 where
-    TUpgrErr: fmt::Display,
+    TUpgrErr: error::Error + 'static,
 {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
@@ -467,7 +467,7 @@ where
             ConnectionHandlerUpgrErr::Timer => {
                 write!(f, "Timer error while opening a substream")
             }
-            ConnectionHandlerUpgrErr::Upgrade(err) => write!(f, "{err}"),
+            err @ ConnectionHandlerUpgrErr::Upgrade(_) => crate::print_error_chain(f, err),
         }
     }
 }