diff --git a/swarm/src/handler.rs b/swarm/src/handler.rs
index cf8b9c1f2cb9..5ff30009cf6a 100644
--- a/swarm/src/handler.rs
+++ b/swarm/src/handler.rs
@@ -467,7 +467,7 @@ where
             ConnectionHandlerUpgrErr::Timer => {
                 write!(f, "Timer error while opening a substream")
             }
-            ConnectionHandlerUpgrErr::Upgrade(err) => write!(f, "{err}"),
+            ConnectionHandlerUpgrErr::Upgrade(err) => crate::print_error_chain(f, err),
         }
     }
 }